c: ^ WAR D E P A RTME N Tl TE C H N I C AL MANUAL ST. LIBRARY MAY 0 1 - ^ L KEYERS TG-10-A, G-10-B, TG-10-C, TG-10-D, G-10-F, TG-10-G, TG-10-H, AND TG-10-J VAR DEPARTMENT • 27 MARCH 1944 .„. G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le WAR DEPARTMENT TECHNICAL MANUAL T M 11-447 Thi> manual >uper>idi> TM 11-447, Keyer TG-10-J (Automatic, 60 Cycle>) and Keyer> TG-10-A, TG-10-B, TC-10-C, TG-10-D, TG-10-F, 15 May 1943 and 25 Augu>t 1943, including Supplemrnt No. 1, 15 Augu>t 1943. KEYERS TG-10-A, TG-IO-B, TG-10-C, TG-10-D, TG-10-F, TG-10-G, TG-10-H, AND TG-10-J WAR DEPARTMENT 27 MARCH 1944 United State> Government Printing Office Wa>hington : 1944 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le WAR DEPARTMENT, WASHINGTON 25, D. C., 27 March 1944. TM 11^47, Keyers TG-10-A, TG-10-B, TG-10-C, TG-10-D, TG-10-F, TG-10-G, TG-10-H, and TG-10-J, is published for the information and guidance of all concerned. [A. O. 300. 7 (30Oct43).] BY ORDER OF THE SECRETARY OF WAR: G. C. MARSHALL, Chief oj Staff. OFFICIAL: J. A. ULIO, Major General, The Adjutant General. DISTRIBUTION: As prescribed in par. 9a, FM 21-6; Bn and H 1, 2, 4, 6, 7, 11, 17, 18 (2); 1C 11 (2). 1C 11: T/O 11-267, Sig Co, AAF T/O 11-217, Sig Co Avn T/O 11-287, Sig Co Depot Avn T/O 11-77, Sig Co Rad Int T/O 11-287, Sig Co Sv Gp T/O 11-247, Sig Co Wg T/O 11-47, Sig Tr Cav Div T/O 11-57, Sig Co Armd Div T/O 11-7, SigCoInf Div T/O 11-317, Sig Co Mt Div T/O 11-97, Sig Co Operation T/O 11-18, Sig Co Operation Wire Armd T/O 11-15, Sig Co Hq Co Bn Sig Co Rad Armd Sig Go Mtz Div Sig Fixed Rad Sta Co (For explanation of symbols see FM 21-6.) G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le Contents SECTION I. DESCRIPTION Paragraph Page General 1 1 Differences 2 1 Components, weights, and dimensions 3 3 Power supply ***< 4 4 Controls 5 4 H. INSTALLATION AND OPERATION Initial procedure 6 6 Installation 7 6 Preparation for use 8 7 Operation 9 7 Adjustments for field upkeep 10 10 III. FUNCTIONING OF PARTS Power switch 11 11 Voltage amplifier 12 11 Oscillator 13 12 Power amplifier 14 12 IV. MAINTENANCE Preventive maintenance 15 14 Servicing 16 14 Lubrication chart 17 17 Trouble location chart 18 18 Point-to-point d-c voltages 19 21 Point-to-point resistances •__ 20 23 Instructions for fungiproofing and moistureproofing. . 21 25 V. SUPPLEMENTARY DATA Table of replaceable parts. 22 32 Names and addresses of manufacturers 23 48 III M55857G G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le Destruction Notice WHY—To prevent the enemy from using or salvaging this equip- ment for his benefit. WHEN—When ordered by your commander. HOW—1. Smash Use sledges, axes, hand axes, pickaxes, ham- mers, crowbars, heavy tools, etc. 2. Cut Use axes, hand axes, machetes, etc. 3. Burn Use gasoline, kerosene, oil, flame throwers, in- cendiary grenades, etc. 4. Explosives Use firearms, grenades, TNT, etc. 5. Disposal Bury in slit trenches, fox holes, other holes. Throw in streams. Scatter. Use anything immediately available for destruction of this equipment. WHAT—1. Smash All vacuum tubes, controls, dials, reels, trans- formers, and relays. 2. Cut All connecting wires, cables, etc. 3. Bend and/or break Jacks and plugs. 4. Burn All of the above equipment, training manuals, records, etc. 5. Bury or scatter Any or all of above pieces after wreck- ing them. DESTROY EVERYTHING SAFETY NOTICE Since the voltages employed in this equipment are sufficiently high to endanger life, every reasonable precaution has been observed in design to safeguard the operating personnel. Care must be taken, however, to avoid bodily harm through contact with high-voltage plate circuits, or with the power plant output line. IV G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le This manual supersedes TM 11-447, Keyer TC-10-J (Automatic, 60 Cycle*) and Keyers TC-10-A, TC-10-R, TC.-10-C. TG-10-n, TC-10-F, IS May 1943 and 25 August 1943, including Supplement V.. 1, 15 August 1943. Section I Description 1. GENERAL. a. Purpose. Keyer TG-10-(&) is an automatic unit for providing audible code practice signals from an inked-tape recording, and is included in and is a part of Code Practice Equipment EE-94-B, EE-95-B, and EE-96-B. The symbol (&) refers to all models of Keyer TG-10, that is, models A, B, C, D, F, G, H, and J. There is no model E or model I. For simplicity, models A, B, and C are referred to as Keyer TG-lO-(1), and models D, F, G, H,. and J are referred to as Keyer TG-10-(2). The output of Keyer TG-10-(&) is an audio frequency note of 800 cycles per second with sufficient power to supply a number of headsets, 500 to 1,000 if necessary, or practice tables directly. The keyer, a self-contained unit, is ready for operation when connected to power mains and headsets directly or through practice tables. b. External keying. Keyer TG-10-(&) may also be operated by an external telegraph key, either manual or automatic, supplying 500 to 1,000 headsets with an 800-cycle note. When an external key is used, the tape mechanism should not be operated. C. Ink recording. Except for Keyer TG-10-A, Keyer TG-10-(&) is equipped with suitable guide and pressure rollers, which permit its use with any one of several types of ink recorders when none is furnished with the tape-pulling mechanism (par. 9d). 2. DIFFERENCES. All models of Keyer TG-10-(&) are mechani- cally and electrically similar. Differences are explained below and elsewhere in this manual. a. Keyers TG-10-B and TG-10-C are identical. Ife Keyers TG-10-A, TG-10-B, and TG-10-C are identical except that the power and filament transformers and the motor of Keyer TG-10-A are wound for 25-cycle instead of 60-cycle current. C. Keyer TG-10-(2) differs from other models in the following respects: (1) The motor, cone, driving assembly, and related parts are mounted differently. (2) The speed indicator assembly is different. G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le 20 IOSIU tosiR!' Fifit-RE 1. Ketjer TG-lO-(l), front view. 103 TL-7324 79 106 94 62 123(R) 114 8 20 IOS(U I05(R) 99(L) 59 56 9'9(R) FIGURE 2. A'ej/er TG-10-(2), front view. 103 TL-7325 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :2 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le (3) A dial lamp has been added. (4) A slotted, screw-driver bias adjustment (26)* (fig. 4) has been added, giving two bias adjustments (26) and (40) (fig. 6). (5) A motor switch (43) (fig. 2) has been added. (6) An additional roller (99 (T)) (fig. 2) has been added. (7) Resistor (39) (figs. 8 and 11) (4,000-ohm) replaces resistor (27-1) (figs. 7 and 11) (4,700-ohm). (8) Resistor (27) (figs. 8 and 11) (2,500-ohm) replaces resistor (27-2) (figs. 7 and 11) (4,700-ohm). (9) Resistor (40) (fig. 8) (200-ohm) has been added. d. Resistors (36-1) (250-ohm) and (36-2) (250-ohm) have been added (fig. 8) on Keyer TG-10-J. 3. COMPONENTS, WEIGHTS, AND DIMENSIONS, a. Com- ponents, weights, and dimensions of Keyer TG-10-(<&) are listed below: Maximum over-all dimensions including projections Quantity Name of part Height (inches) Width (inches) Depth (inches) Weight (pounds) 1 Keyer TG-10-(&): Keyer TG-10-A Keyer TG-10-B, C 10% 10% 21 H 21% 24 18K 18# 18^ 70 61 63 Kever TG-10-(2) 11 Set vacuum tubes: Signal Corps Commercial type type 2 tubes VT-96 6N7 2 tubes VT-115 6L6 2 tubes VT-116 6SJ7 1 tube VT-244 5U4-G 1 tube VT-252 923 Tapes, inked paper Reels, take-up NOTE: Accessories required are a monitoring headset and an external key. b. Keyer TG-10-(&) is mounted in a cabinet, as shown in figures 1 and 2. C. Removed from the cabinet, the keyer fits a standard 19-inch relay rack. The height of the panel is 8% inches. Keyer TG-10-(&), except Keyer TG-10-A, weighs 40 pounds without its cabinet. Keyer TG—10-A, without the cabinet, weighs 47 pounds. •Numbers in parentheses refer to parts of this equipment as shown in photographs and diagrams through- out this manual. G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le 4. POWER SUPPLY. Keyer TG-10-(&), except Keyer TG-10-A, operates on 115-volt, 60-cycle alternating current. A voltage vari- ation within the range of 95 to 120 volts will not substantially affect the operation of tl\e instrument. Keyer TG-10-A operates on 110-volt, 25-cycle alternating current. 5. CONTROLS. Controls, adjustments, switches, and other parts on the front panel are— a. A monitor jack (8) (figs. 1 and 2) for plugging in a headset when adjusting the bias and phototube aperture, or for monitoring when keyer is in operation. b. A volume control (20) (figs. 1 and 2) with slotted shaft for screw driver adjustment. c. A bias L control (105 (L)) (figs. 1 and 2), to provide a fine ad- justment of bias after bias control (26)'(fig. 4) on the chassis has been adjusted. d. A power-off-key-tape switch (105 (R)) (figs. 1 and 2). e. Phototube and aperture adjustment (59) (figs. 1 and 2). f. Phototube housing (56) (figs. 1 and 2). g. Tape-rewind mechanism (103) (figs. 1 and 2). 311 60 69 42 33 128 127 IE5 126 TL-7326 FIGURE 3. Keyer TG-lO-(l), rear oiew, cabinet removed. G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le 138 10 35 TL-7327 FIGURE 4. Keyer TG-10-(2), rear view, cabinet removed. h. Tape reels (123 (R)) and (123 (L)) (figs. 1 and 2). i. Mirror housing (62) (figs. 1 and 2). j. Tape-speed indicator dial (94) (figs. 1 and 2).- k. Tape-speed indicator control (106) (figs. 1 and 2). 1. Tape-puller roller (79) (figs. 1 and 2). m. Tape-content pressure roller (85) (figs. 1 and 2). n. Take-up reel drive belt (98) (figs. 1 and 2). O. Take-up reel shaft assembly (96) (figs. 1 and 2). p. Motor OFF-ON switch (43) (fig. 2) (on Keyer TG-10-(2) only). q. Tape guide rollers (99 (L)) and (99 (R)) (figs. 1 and 2). r. Tape guide roller (99 (T)) (fig. 2). 570810°—44- G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le Section II Installation and Operation 6. INITIAL PROCEDURE, a. Unpacking. Keyer TG-10-(&) is packed in an individual carton. The unit may be removed by opening the carton at the top, carefully removing the cardboard blocking pieces from the front and sides, and lifting the cabinet from the carton. b. Tubes. A set of vacuum tubes, exclusive of the photoelectric cell and exciter lamp, is in a separate cardboard container issued with the keyer and marked "Tube Set for Keyer TG-10-(&)." Inside the carton are seven vacuum tubes, each separately packed and marked with its tube number. A list of these tubes is given in para- graph 3a. After the tubes have been impacked, insert them in the proper sockets on the chassis. The keyer is shipped with the photo- electric cell and exciter lamp already installed. 7. INSTALLATION, a. Selection of output. Three output impedances are provided at the output terminal board (35) (figs. 3 and 4) on the rear of the chassis. Impedance of 4, 8, or 15 ohms may be selected by connecting to the common terminal and the terminal with the desired impedance. The most suitable matching impedance may be determined from the number of headsets to be connected to the keyer and the impedance of each. If many headsets are used, the 4-ohm output terminal is most suitable. If only a few headsets are connected, the 15-ohm output terminal is preferable. Try all output terminals and use the one giving most satisfactory operation. The power used by one headset is considered about 5 milliwatts. b. Wiring. (1) TABLE MOUNTING. If the keyer is to be operated from a table or bench, place it in position and run a pair of leads from the output terminals (35) (figs. 3 and 4) to the volume- control board (sometimes called a patching board). (Information on wiring of the volume-control board may be found in TM 11-432.) Plug the power cord into the receptacle (11) (figs. 3 and 4) on the rear of the chassis, and'into a convenient power outlet. (2) RACK MOUNTING. If several keyers are to be mounted together on a standard relay rack, remove the unit from the cabinet by first removing the screws (134) (figs. 1 and 2) on the ends of the G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le panel, and then the three screws holding the rear of the chassis to the bottom of the cabinet. The panel and chassis are fastened together so that the keyer can be mounted, using the panel screws, to the relay rack. Install external wiring as described in (1) above. 8. PREPARATION FOR USE. a. Adjustment of light gate. The removable cover (59) (figs. 1 and 2), inclosing the phototube, contains a small aperture or opening, through which light passes. The position of the aperture under the tape is adjusted by sliding the cover in or out, and locking it in position with the knurled nut (165) (figs. 5 and 6) below it. To adjust the position of this aperture, fold the tape at a point corresponding to a space between dots and dashes, which as a rule is at the point where the inked line is oS the center of the tape. By placing the end of the tape next to the light aperture, the cover can be manipulated until the hole is opposite the middle of the hiked line. b. Threading. When the rewind mechanism (103) (figs. 1 and 2) is pulled forward, it will allow a full reel of tape (123 (R)) (figs. 1 and 2) to be put in place. (Wind the reel so that the inked side of the tape faces the hub of the reel.) Hole the reel, with the square driving hole facing the operator and the free end of the tape suspended at the operator's right side. Snap the reel in place over the ball catch, with the square driving hole toward the crank, and return the rewind mechanism to its original position with the reel vertical. Disengage the pressure roller (85) (figs. 1 and 2) from the puller roller (79) (figs. 1 and 2) and pass the tape, inked side up, under guide roller (99 (R)) (figs. 1 and 2), over the light gate (59) (figs. 1 and 2), under guide roller (99 (L)) (figs. 1 and 2), to the left of guide roller (99(T)) (fig. 2) (not-on Keyer TG-10-(!)) and over the puller roller (79) (figs. 1 and 2). Insert the end of the tape in one of the slots in the hub of the take-up reel (123 (L)) (figs. 1 and 2) and, turning the wheel by hand to the right, wind on a few layers of tape. 9. OPERATION. a. Tape keying. (1) START. Turn the rotary switch knob (105 (R)) (figs. 1 and 2) to TAPE, to start the motor and amplifier. Allow the set to warm up for a few minutes. To engage the drive, lower the pressure roller (85) (figs. 1 and 2). The tape will then be forced against the puller (79) (figs. 1 and 2), and the keyer will reproduce the signal recorded on the tape. (2) BIAS. With the tape running, plug a headset into the MONITOR jack (8) (figs. 1 and 2). With the BIAS knob (105 (L)) (figs. 1 and 2) vertical, use a screw driver to rotate the bias control (26) (fig. 4) (located on the chassis to the left of motor (42) (fig. 4)) on Keyer TG-10-(2) until a clear signal is heard. (On Keyer TG 10^(1) rotate the bias control knob (105 (L)) (fig. 1).) If the control is turned too G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le far to the left, no signal will be heard, or if it is turned too far to the right a steady signal will result. The correct position is between these extremes. The adjustment should not be critical. If the bias control requires a very close setting, recheck the adjustment of the light gate. Since the line voltage supplying the keyer changes, it may be necessary to reset the bias control. The BIAS knob (105 (L)) (figs. 1 and 2) provides a fine adjustment of the bias, and is used in normal operation of the keyer, after the bias control (26) (fig. 4) on the chassis has been properly adjusted. (3) VOLUME. The volume of the signal delivered to the practice tables may be varied by the screw driver adjustment (20) (figs. 1 and 2) marked VOLUME. Turning to the right increases the volume. (4) TAPE SPEED. The speed control knob (106) (figs. 1 and 2) controls the rate of speed of the tape and the speed of the transmission. Before turning the speed control knob, disengage the tapejeed by lifting the pressure roller (85) (figs. 1 and 2). The indicator dial (94) (figs. 1 and 2) is calibrated in feet per minute to indicate the linear speed of the tape. NOTE.—It may be necessary to improvise in order to keep the tape taut while the unit is in operation. One way is to place a paper clip under the top panel screw (figs. 1 and 2) and bending it so it acts as a brake on the reel (123 (R)) (figs. 1 and 2). (5) MOTOR SWITCH. On Keyer TG-10-(2), when using the keyer as a tape puller with a separate inker, the motor switch (43) (fig. 2) will permit turning the motor on regardless of the position of the rotary switch (105 (R)) (fig. 2). b. Rewinding. To return the tape to the magazine reel (123 (R)) (figs. 1 and 2)— (1) Disengage the drive by moving the pressure roller (85) (figs. 1 and 2) upward and away from the puller roller (79) (figs. 1 and 2). (2) Remove the tape from the puller roller so that it feeds from the reel (123 (L)) (figs. 1 and 2) to the guide roller (99 (L)) (figs. 1 and 2) under the phototube housing and directly to the guide roller (99 (R)) (figs. 1 and 2). (3) To return the tape, turn the handle of the rewind mechanism to the right. NOTE.—Do not rewind the tape too fast, or it may be torn and the rewinding gear damaged. Keep the tape taut. C. External keying. To transmit the signal of a manually oper- ated key to the practice tables, turn the rotary switch knob (105(R)) (figs. 1 and 2) to KEY (connected to the KEY terminals (10) (figs. 3 and 4) on the rear of the chassis). With manual keying the bias 8 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le FicifRE 5. Keyer TG-lO-(l), chassis, underside. control is out of the circuit, but the volume control functions exactly as it does with tape keying. d. Tape pulling for ink recorder. To operate the puller me- chanism with a separate inker, first locate the inker to the right of the keyer. Remove the magazine reel (123(R)) (figs. 1 and 2). Thread the tape on the inker reel under the guide roller (99(R)) (figs. 1 and 2), under the phototube housing (over the phototube housing in Keyer TG-lO-(1)), under the guide roller (99(L)) (figs. 1 and 2), to the left of the guide roller (99 (T)) (figs. 1 and 2), and over the puller roller (79) (figs. 1 and 2). The part of the rollers coming in contact with the top, or inked side of the tape, have their centers recessed and will not smear freshly inked characters. The tape may fall freely into a basket on the floor. When using Keyer TG-10-(2) with an ink recorder, turn the motor switch (43) (fig. 2) ON, so that the motor is operated independently of the rotary switch knob (105(R)) (fig. 2). If the ink recorder requires an oscillator to actuate the ink stylus, turn the rotary switch knob (105(R)) (fig. 2) to KEY, connect a manually operated key to the KEY terminals (10) (figs. 3 and 4), and connect the ink recorder signal input terminals to the output terminals (35) (figs. 3 and 4) of the keyer. e. Pressure roller. When the keyer is not in use, set the pressure roller (85) (figs. 1 and 2) up with the feed disengaged, to avoid damaging the drive roller (79) (figs. 1 and 2). G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le FIGURE 6. Keyer TG-10-(2), chassis, underside. 10. ADJUSTMENTS FOR FIELD UPKEEP. a. Tubes. A pos- sible source of trouble is a defective tube. Check all tubes every 500 hours of operation (par. 16f). b. Photoelectric cell. Should it Become necessary to replace the photoelectric cell, refer to paragraph 16g. c. Exciter lamp. The exciter lamp (9) (figs. 3 and 4) contains two filaments, only one of which is used at a time. If the lamp fails to light when the rotary switch is at TAPE, see paragraph 16h. d. Fuse. The keyer is shipped with a fuse in place in its holder (45) (figs. 3 and 4) on the rear of the chassis. If the keyer fails to operate when turned on, check the fuse. If burned out, replace fuse as outlined in paragraph 16i. e. Operator maintenance. Preventive maintenance performed by the operator is discussed in paragraph 15. 10 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 4 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le Section HI Functioning of Parts 11. POWER SWITCH. The power switch (31) (figs. 5 and 6) is a three-position rotary switch with the positions marked OFF, KEY, and TAPE. At OFF the entire unit does not operate. The pullei motor of Keyer TG-10-(2) is turned on and off independently by a motor switch (43) (fig. 2) when used as a tape puller. At KEY, the oscillator-amplifier section is turned on and the hand key controls the tone output (par. 9c); both the puller motor (42) (figs. 3 and 4) and the exciter lamp (9) (figs. 3 and 4) are inoperative. At TAPE, the motor and the lamp are turned on, in addition to the oscillator- amplifier, and.the unit functions as a full automatic tape keyer. 12. VOLTAGE AMPLIFIER (figs. 7 and 8). a. When the main switch is set at TAPE, light falling on Tube VT-252 (phototube Vi) causes the current to flow through its plate resistors, making the voltage positive at the upper end of resistor (13-1) and negative at the lower end of resistor (13-2) (figs. 7 and 8). The voltage across the bias controls developed by the rectifier bleeder current causes a positive potential at the cathode of Tube VT-116 (V2) with respect to the lower end of resistor (13-2). From the cathode of tube (V2) to its grid, the bias voltage is from plus to minus, and the phototube load voltage is from minus to plus. These two voltages are in oppo- sition; and the difference furnishes the trigger voltage, so that with a greater light intensity, the grid voltage is more positive with re- spect to the cathode, and with less light intensity, it is more negative. b. Resistor (15-1) is the plate load for (V2) as well as the grid resistor for Tube VT-116 (V3). This tube and tube (V3) form a two-stage d-c amplifier. As the grid of tube (V2) becomes sufficiently negative, there will be no plate current in tube (V2) and no voltage across its plate load. Tube (V3) will then have no grid bias. When the grid bias of tube (V2) becomes zero (or positive with respect to its cathode), plate current flows through its plate load resistor (15-1). Tube (V3) will then have a high negative bias. c. As in the case of tube (V2), when the grid of tube (V3) becomes sufficiently negative, Tube VT-96 (V4) will have no bias. When the grid voltage on tube (V3) approaches zero, tube (V4) will have a high 11 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 5 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le negative bias, and the plate current in one section will be cut off. When the grid voltage approaches zero, the plate current of tube (V3) will cause a voltage to be developed across resistor (16) in such a direction that the upper end will be negative with respect to the lower end, which is connected to a resistor (27-2) (fig. 7) or (39) (fig. 8). This voltage is impressed directly across the grid and cathode of the left-hand section of tube (V4) and acts as the control voltage for this tube. 13. OSCILLATOR (figs. 7 and 8). a. Tube, (V4) is a double-triode functioning as a tone oscillator (of the multivibrator type) at a frequency of approximately 800 cycles. This frequency is determined mainly by the values of the tank circuit made up of inductor (5) and capacitor (2-2). The feedback circuit, composed of capacitor (1) and resistor (17), also has some effect on the frequency. Any small voltage variation in the plate circuit of the right-hand section of tube (V4) is fed to the grid of the left-hand section through capacitor (1) and resistor (17). This is amplified by the left-hand section and fed back to the grid circuit of the right-hand section through the capacitor (2-1). Thus energy is fed from each section of the tube to the other section in the proper phase, and oscillation takes place. In order to keep the wave shape of the signal from squaring, it is necessary to prevent too great a flow of voltage back to the grids. To do this, the plate loads of each section are center-tapped at the junction of resist- ors (19-1) and 19-3) and resistors (19-2) and (19-4). The a-c returns to the. grids are brought to these junction points. b. When the light source and tape reduce the left-hand grid voltage of tube (V4) to zero, oscillation takes place. No light on tube (Vj) causes the grid voltage of tube (V4) to be highly negative, which results in the plate current being cut off through the left-hand section of tube (V4) so that there can be no oscillation. c. When the main control switch is thrown to KEY, the grid of tube (V3) is connected to ground through the key. When the key is open, the grid voltage of tube (V3) is zero and the oscillator is inop- erative. When the key is pressed, connecting the grid of tube (V3) to ground, a high negative voltage appears on its grid and the tube (V4) oscillates. 14. POWER AMPLIFIER (figs. 7 and 8). a. The 800-cycle voltage developed across the tank circuit is fed across resistor (20), the vol- ume control. This voltage is impressed on the grid of the left-hand section of the double-triode, phase-inverter Tube VT-96 (V5). The signal voltage is then amplified and appears across the plate load resistor (22-2); then, through its coupling capacitor, it is impressed on the grid of Tube VT-115 (V7). At the same time, the grid resistor 12 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 5 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le for tube (V7) acts as a voltage divider. The portion of the voltage developed across resistor (23) is fed to the right-hand grid of Tube VT-96 (V5). The output from this half of tube (V5) is fed to the grid of Tube VT-115 (V6). This produces the necessary 180° phase difference between the signals appearing on the grid of tubes (V6) and (V7). The voltage divider, resistors (15-2) and (23), is properly proportioned to make these voltages equal in value. On Keyer TG-10-J (fig. 8) resistors (36-1) and (36-2), in series with the con- trol grid of tubes (V6) and (V7), act as high-frequency chokes to pre- vent parasitic oscillations when glass tubes are used instead of metal tubes in the keyer. b. The output voltage from tubes (V6) and (V7) appears across transformer (34). The low impedance secondary of this transformer has a resistor connected across the 15-ohm output winding, in order to keep tubes (Va) and (V7) partially loaded when external loads are removed from the keyer. C. The rectifier circuit of Tube VT-244 (V8) has a resistor (29) con- nected in series with the load which serves to limit the peak and surge currents to capacitor section (4-3). Resistor (30) is connected in series with inductor (6), in order to provide the proper voltage for the screen grids of the output tubes (V8) and (V7). 576810°—44 3 13 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 5 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le Section IV Maintenance Caution: Read and carefully observe the precautions given in the safety notice at the front of this manual. 15. PREVENTIVE MAINTENANCE. a. Scheduled inspections. The operator should set up a regular preventive maintenance schedule covering the points listed below and any additional points needing regular attention. A check-up based on this schedule should be made daily, if the keyer is used daily, or at regular intervals, if the keyer is not used every day. This check-up will reduce repairs and delay. NOTE. Do not abuse or handle roughly any of the controls or components on the front panel. b. Inspection points. The check-up should include the follow- ing: (1) See that the exciter lamp and dial lamp light. (2) Check the fuse. If a blown fuse is replaced and the new fuse burns out, check for short circuits in the unit. Never replace a fuse with one oj higher rating. (3) Inspect all tubes to see if filaments light. For metal tubes, touch a moistened finger tip to the shield after the set has been on for a few minutes. The shield should be warm. (4) Make a visual inspection of the unit. (5) Inspect all plugs, cables, and connectors. (6) Keep the equipment as clean and as free of dust as possible. (7) See that all roller shafts, gears, and related parts are properly lubricated at all times. For detailed instructions on lubrication see paragraph 17. (8) See that the light aperture is clean. (9) See that the mirror lens is clean (par. 16a(l)). (10) See that rollers and shaft collars are not so tight on the shafts that they bind, or so loose that they cause excessive wear. (11) See that all collar and roller keys are tight. 16. SERVICING. a. Lens and mirror system. (1) Clean the exposed side of each lens (60) (figs. 3 and 4) daily with a soft cloth or cleansing tissue. 14 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 5 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le Caution: Do not use a tissue, cloth, or any material that con- tains dirt, grit, or any abrasive or the lens surface will be scratched. (2) At least once a week, remove the mirror housing casting (62) (figs. 1 and 2), and clean the mirror lens. (3) Remove the phototube cover (59) (figs. 1 and 2) once a week and clean the light aperture carefully with a piece of fine wire to remove any accumulation of grit or lint. (4) The position of the lens and mirror housing is adjustable to per- mit positioning the light beam on the small aperture in the phototube cover (59) (figs. 1, 2, 5, and 6). By turning the lower screw (165) (figs. 5 and 6) on the housing, which is provided with a spring tension holding arrangement, the housing may be moved away from, or brought closer to the panel. Lateral adjustment of the lens and mirror housing is obtained by loosening the upper screw, moving the housing to the desired position, and retightening the screw. b. Drive cone and roller. A supply of neoprene rings is included in the spare parts kit. To replace the rings— (1) Release the setscrew in the.collar. (2) Remove the puller-shaft retaining collar (72) (fig. 4) as follows: grasp the tape-puller roller (79) (figs. 1 and 2) and pull the shaft forward. This releases the cone-diiven roller assembly, which is keyed to the shaft. (3) To remove and replace the neoprene ring on Keyer TG-10-(2), remove the nut and outer washer of the cone-driven roller assembly. After the shaft of Keyer TG-lO-(l) has been pulled forward, the old neoprene ring can be rolled off its metal pulley and the new one installed. (4) In reassembling, be sure to set up the retaining collar (72) (fig. 4) so that excess end play of the puller shaft is prevented; but be sure that this adjustment is not tight enough to cause binding. (5) About once a month clean the neoprene ring (77) (figs. 3 and 4) and the driving cone (74) (fig. 4) with benzene and a soft cloth to remove any oily film which may have accumulated. Do not use abrasives, such as sandpaper, on the driving cone. C. Puller roller. A supply of puller rollers (79) (figs. 1 and 2) is included in the spare parts group. To replace the rubber portion, remove the acorn nut on the front of the roller and take off the outer washer. Remove the rubber puller, install a new one, and reassemble. d. Transformers. One spare transformer of each type required by Keyer TG-10-(&) is included in the spare parts group. C. Amplifier. Figures 7 and 8 are circuit diagrams of the amplifier and oscillator. The same diagram is attached to the bottom plate of the chassis. Paragraphs 18, 19, and 20 give the necessary informa- tion for checking and servicing the amplifier. 15 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le f. Tubes. Tubes in the keyer may be checked in a standard tube tester. Replace all defective tubes. g. Photoelectric cell. To replace the photoelectric cell (Vi) (figs. 7 and 8), first loosen the knurled nut (165) (figs. 5 and 6) under the protruding housing and remove the housing cover (59) (figs. 5 and 6). Replace tube and housing cover. h. Exciter lamp. The exciter lamp (9) (figs. 3 and 4) contains two filaments. To change from one filament to the other, first remove the bulb from its socket and then reinsert it after turning it through 180° or halfway around. This will connect the spare filament. If both filaments are burned out, replace the bulb. If no spare exciter lamps are available, replace it with a standard 32—32 candlepower, No. 1000 automobile headlight bulb. To adjust the focus of the light beam, loosen the two screws holding the exciter lamp socket, move the lamp and socket to the optimum position, and retighten the two screws. i. Fuse. To check the fuse located at the rear of the chassis, un- screw the red portion of the fuse holder (45) (figs. 3 and 4) with a screw driver. The fuse will come out with the screw cap. If it is defective, insert a new one. If fuses are not available from spare stock, the keyer may be fused with a standard 3AG automotive fuse having a rating of 3 amperes at 250 volts. 16 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le i 5 - ^' i W ^*i *- f, M PH o3 ^> d *- .Q (-» *O ^ 5 ^ CD Q) JH V a « ^ CD "3 o5 s ° fj w +^ •rt °^ 03 S CD CH S C ^ a o p . rf «2 CO ^ c3 o3 I8 f! cc 3 ^2 M .9 a _s 1 «> s ^ ^ .| 11 3 V * i l-g 111 •2 a I c § 1 - s rj rH •3 CD § GO CQ ^2 rt'" 02 ^3 -5 — "#» Q 5 ""5 h O „• -*» « "is "S A .g QQ o9 ^ "fl 4A "S a 0 a 1 .0 > o o . c ^ o , c S o o 1 C "^' C S a O 03 O 03 0 03 Service period O fI hours operati month interv hours operati month interv hours operati month interv hours operati month interv hours 4* O3 -8 (H 2 'c | o °, co ra ° * tervals. £ | I! ss •s £ 1! 3 11 C O ^ i o .5 o .3 _n ° O >-H O IN O IN 0 c o" 5 S g g i o § o I I 1 1 ! 1 | 1 t "S-M 1 1 •a T3 •o 1 •a T3 o< £ ID P. £ i 1 3 Sj g 's 'a 0 3 3 +2 .Si '3 •3 SjB a* O* T3 o1 O" i O1 cr or ft 3 j3 0 wl jS ^ ^ ^ 'S • H . TAPE position—tape operating. After the troubles indi- cated by symptoms (1) to (3) in a above and (1) to (11) inclusive in G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 5 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le b above have been corrected, check operation at TAPE as follows: satisfactory operation at KEY and no operation at TAPE limits the trouble to tubes (V,), (V2), and (V3) (figs. 7 and 8), and their asso- ciated mechanical and electrical parts. Make these tests only after it has been definitely assured that the phototube aperture, lens and mirror, controls, etc., are set according to the operation instructions in paragraph 9. The point-to-point resistance check should indicate all probable defects. Symptom Cause (1) No plate voltage Shorted capacitor (4-1) (figs. 7 and 8). tubes (V2 and V3) Open resistor (27--1) ((27-2) (fig. 11) on (figs. 7 and 8). Keyer TG-lO-(1)), (27) ((39) (fig. 11) on Keyer TG-10-(2)), ((26) (figs. 7 and 8), or (40) (fig. 8) (not on Keyer TG-lO-(1)). Loose connection to tube socket. (2) No keying with Open resistor (13-1) or (13-2) (figs. 7 and tape. 8). Resistor (13-1) or (13-2) shorted to shield ground (figs. 7 and 8). Loose connection to tube socket. 19. POINT-TO-POINT D-C VOLTAGES. The tube socket pins from which the measurements shown in the following table are made are identified by numbers appearing on the bottom of the sockets. The readings are taken with line voltage of 115 volts; both bias con- trols at extreme right; volume control advanced one-half of its total rotation; main switch turned alternately from KEY to TAPE, as noted; photocell adjustable cover in normal operating position with- out paper tape or other subtsance interrupting light beam; and with nothing connected to OUTPUT terminals or KEY terminals. The location of the tubes from the bottom of the chassis is shown in figures 9 and 10 where they are identified by the type and tube number. The following readings should be checked with a 20,000-ohm-per-volt meter only. 570810°—44——4 21 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 5 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le o o $ X x ;x: X' X X 1 X H Xi s. i 1 9Q 1 X Xi X X * X X X X ?* 1O o co ic m >O 1C iO OS i-H CO CO M" ^ 1C t- g t> ^ 6. a CN OQ 1O 1O 1C 1O •* •* ^ •* a E CO CO CO CO V ct CO C-T at at at oL |3 I-H C^ O t"~ O C1-! O CN CC M CO « CO CC « (N CO CN 1 > cq N co CO cq cc i-H ^-< 1 Q O Q Q s to 1O 1O >o oo ob 30 00 QC at 1 1 00 OC at at at 00 2 0 0 IN IN CM CN ^ CN CM CM IN CM « CN CM CN C ec I 1 iO *O CO CO CO CC J= CO CC id CO CC CC CO e CO 1C :~ E I T 7 *r Ir Ir Ir SSS £3 3 3 CN CN CN CN CN CN rt Cs CN IN "o ^ CD O O CN 00 t^ CO 00 CO O 1O 1C X t- •* P s?s 0 CN C CN C 1 iH »- cr CO CO t- PL, | Q 3 PH c # ^ P c 3 O iO iO iO iO CO W 00 00 00 00 00 00 -O CO CO 2 CO CC I K CO o H 4 iooot obat at at oo — c; CM f^ rn f^t e£> 'T 1C 1C >o ^t ip -C CO CC ¥ CO CC ^ I— 1 tj- ^ C .— 1 ^H ^H TH Oi C35 a Ol CT p™ T- ^ i— I O | | | | | | 1 1 1 I | | I 1 1 s E- E- H H H H H H H EH E- EH H E- ^4 H E- H H 3 > > » » » » > ** > > Iff ^ > >• > c , 55 g . J > > > ^>> \ s~ •. X* - -7 - .E > > > > > > > > ^ > » G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 5 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le 20. POINT-TO-POINT RESISTANCES, a. Resistance in ohms from socket contacts to chassis. The tube socket pins from which the measurements shown in the following tables are made are iden- tified by numbers appearing on the bottom of the sockets. The con- ditions for taking these measurements are that: the plug be discon- nected from the power source, both bias controls at extreme left, the volume control be rotated to extreme right; and the main switch at TAPE. The location of the tubes from the bottom of the chassis is shown in figures 9 and 10 where they are identified by type and tube number. 23 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le o o o o o o o o t- o m >o O H* 00 iO CM CM O O O O "5 "5 O O CM "O IN C-5 oo ic" 00" «5" i-T t- t^ tN O" OC" 00" i-T S1^ §OOOOO O 0 O O 0 t- t- r- r- t- t^ §§§§§§ t^ t^- t^ t^ t- t- 1C tO >C iO 1O 1C CO CO CO C O CO CO o o o o o ^ ^ ^* o o o o o o °.°.§§§§ 1O" oo o~ CO e^ c- t- t- IN "5 O O t- 1-1 !~• t^ t^ ^- t* T— 1 CM rf — t CM IN 000000 o o o o o o O t^ TtI 1-H O O CM 1^ C^ ^H O O tB i-T m" co" 02" o" o" 00 1> CM CM i-T co" oo" of o" o" §8 Q g Kr O O O O O 1 Jllsil ul O O O O O !§§§§§ 1C iO 00 O O CO Cf o GO" o od" od" 0 t- t- 0 ^ -H •* C M >o 1-5 ig^g^^ 0 Q z p £ §OOOOO O O O O O < •*? o t- -^ ^ -^ -^ w CM t- O O O O m <{ i— 1 1C O CO O O t^ ^H C M CM o" ^H CO O 1C CM IN 1> i-H CM CM T— 1 h" i •> O O O O O O "O O O O O O o" r O O O O O O bl b 3 0 o o o o o o 1 A c o f iO O C^ CO ® 1O 1O o. tf c^ ir c« 1 i— i i— t CO cO i— t i— i l-M i-H CO CO *-^ -H i— 1 I— 1 OS Oi i— 1 i— t ^< ^H O5 O> •-< i-H ^^^^^^ 1 1 1 1 1 1 H H H H E-i H >>>>>> 1 r- >>>>>> h > - M EO •* "S « t* - cM ':-. -r 'ir; v^~ ' t- >>>>>> > >>>>>> > 24 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le b. Resistance from resistor and capacitor mounting card terminals to chassis. The terminals of the resistor and capacitor mounting card (38), from which measurements of resistance to chassis are made, are identified by color coding (figs. 9 and 10)." Resistance measurements from these terminals to chassis are indicated below in the order in which the terminals appear when the bottom of the keyer is viewed with the front toward the observer (except on Keyer TG- 10-(1). The conditions for taking these measurements are that the plug be disconnected from the power source, both bias controls be at extreme left, the volume control be rotated to extreme right, and the main switch at TAPE. Wire color code Resistance to chassis (ohms) Wire color code Resistance to chassis (ohms) Black 0 Yellow 250 Green 300, 000 110, 000 Brown _ 9, 100 0 Blue 115, 000 Green 300 000 Red 115, 000 Red 18, 000 Yellow 1, 500 0 Green _ _ 8, 200 Blue 550, 000 Blue 70, 000 45, 000 Brown 72, 000 18, 000 Red 78, 000 480, 000 Yellow 8, 200 Green 7, 800 Brown -_ _ . _ , 3, 700 Yellow 1, 250 Green _ 280, 000 3, 700 31. INSTRUCTIONS FOR FUNGIPROOFING AND MOIS- TUREPROOFING. The instructions contained herein are a guide for processing Keyer TG-10-(&). a. Unscrew and remove the six screws and washers holding the front panel to the case. b. Turn the unit over on its side and remove the three screws, nuts, and washers holding the chassis to the bottom of the case. c. Turn the unit to original position and slide the chassis out of the case. d. With a clean cloth; remove all dirt, dust, and rust or corrosion, from the case and chassis. e. Remove the following tubes from chassis: 2 Tubes VT-116 1 Photocell (RCA 923). 2 Tubes VT-96 1 Tube 5U4G. 2 Tubes VT-115 1 Exciter lamp (Mazda No. 1000). G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le f. With masking tape, cover— (1) Nine tube sockets (top). (2) Lens of exciter lamp, rear and front of panel. (3) Around base of motor plug and socket. (4) All vent holes around top, sides, and bottom of motor. (5) Oilholes and shafts in all gears and bearings. (6) Neoprene ring for drive roller. (7) Battery connector lugs (at rear). •g. Turn the chassis on its side and remove the four screws holding the panel base to the chassis. Remove the panel. h. Untie the lacing from the cable form and allow the wires to hang loose. i. With masking tape, cover the jack contact and jack collar. j. Loosen the knurled nut at the base of the photocell tube cover and remove cover. Mask the socket with tape. k. The unit is now ready for baking. Place the components in a heating apparatus and bake at a temperature of 160° F. Do not exceed this temperature. Bake the unit for approximately 3 hours. Watch for indications of melted wax; if this becomes evident, lower the baking temperature, adding 1 hour to the baking time for each 10° F. drop. 1. After baking, remove the components of the unit from heating apparatus and apply varnish to all parts and exposed metal with a paint brush or spray. Follow the instructions provided with the kit. m. After the varnish has been applied, replace the unit in the heating apparatus and allow it to remain there for approximately 30 minutes until the varnish has dried. n. Remove the unit from the heating apparatus and repeat the application of varnish. Replace it in the heating apparatus. Shut off heat and allow unit to cool for approximately 12 hours. When the unit has returned to normal temperature and varnish is absolutely dry (not tacky), remove all masking tape. o. Clean off any excess varnish on those portions where it will impede electrical continuity or mechanical action. Extreme caution should be taken when varnishing around moving parts, as varnish, when dry, will impede the mechanical motion. p. Upon completion of baking, remove the unit and spray three or four coats of varnish on exposed elements and surfaces. Do not spray front panel of unit. Spray the inside of the case. When var- nish has dried, remove masking tape. q. Replace all parts removed; oil all shafts, gears, and bearings. Check the unit when assembled and mark it MFP (date), to show it has been fungiproofed and moistureproofed. 26 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le £ a •8 I I H X o 27 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le 28 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le 29 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le •e e M H s Sr t 30 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le —38 T 1- * ON TG-|0-A,B,&C TL-7334 FIOUKE 11. Schematic diagram of resistor and capacitor mounting card. 81 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le €« i^ O 1 § 8- o § " CO CO CO CO •S" «i Ss FJ |e CN v^ V* v« cs 3 i §1 II 1 as aS 1 6? DO D r3 V C ft 0. _o I •1 60 C O s cu cc 00 i 1 I 3 3 OJ O o TS •o M 1 1 1' a •c •S B 1 1 ]U hi o 3 B _o o ft -4i 1 •3 60 "S SP "3 i '3 s^ 5 3 v ft n 1- OQ rv s o O ^S 0 *r h « c „ ., +r fc.- ng C 03 ~ 53 c h C o5 » 3 S 5 0) -g .,. o. S 0 3 0 Is g si ft :l o 2 | •1 -t^~ -w ft «Jf 1 ^ o 1 ^od ffl 3 S 3 CD fe » 3 0 2 •* o s ^ o P 41* o P S u ij O ^ ^ 60 41 -1 -1--I +* 1 "* O H > > ti S^|| Ti C M ^ CM o M ^^ 5 cc =tt !» d e O d •d M i CU e b h ft m 0 o 0 03 ! •g •P *•» I I ! *o pa ! i s O O a a 1 &6 O5 l ll i 'J< I I w a ^4 ^ l— C T-H S tO 6 6 O 0> Q o Q Q Q w CO CO w C O CO a pa 8 a . gj £0 ,~. t~\ ^ A Q . ^ fZ 0 « ^ 0 W CM° W Q ft W- O W S* PH PQ O V ffl i ^ PQ O 1-H ^H fe N "- ffl w "^ PH CO ^t •^H CO "- PH G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 6 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le S CO CS CO t^ CN 1O CO CO co CO r- < E tr p. St PC r S s 1- 5 o w 1 ft >• 6 . f. t '5, 5 c 1 | C •C c c c ^ O I QQ be Q 1 1 0 O" 7 1 0 o 18 O c £ V I O E 3 * w Dur-section aluminum can, 10"0- 1 £ ank, 450-mh. air core, #T-46005___ CO P W) J. *-H rt^ contact, fiber-mounted, screw type, #2-50. ft 4* o3 CO 2 S o S °ll d o^ « 0 •c OJ OC o « G •slg ISJ L, 7 u •g c: o3 ^2 h "S o 3-1 1*1 r\ W •3 c o A « 0 electrolyti- #FPQ-434. -C 1 lj ef S J is o ft T S is 3 |P •-H =t^ S •o § 'S Q ^ 0 S-gs 6 "? a bo -*i tH a + QQ Si"! i, a Ck d M" o ^?x fd S OJ o 'W •u ^a* of i N n TJ 1"^J | ~ ^ ^ « 6 G CD O h OJ ft s O '3 3 T—I d 111 6 a* *^ Ol O I3 ct o cj o — ^ *> .Q fe H s ci ei d ^ ; CD •a U ft G ft 3 s 1 a a '8 O a: 3 1 tn H K „ o» 04 1 CO OJ § erf i-4 iH 0 0 CO CO pQ C 1 iH I 1O I CO SI SI CO CO CO CO CM CO O* CO g I s % £ -.0 W 7 PQ O * -» o M PQ O O ^ O W pQ O co C CO CO CO CO CO CO If CM CM tN CX tN CN CM 94 « 3 £ 1 i d d o' d s ^ ^ PH PH g ffl 2 CO 1 j • 1 oi II •o •o 0 § ^) "§ C O) f 1 "I C — 'E 1 _£ $ £, ft ^ !3 i. i: S 5 £ III * § bC o "E. b 1 § Oscillate Cathode sv 4 1" S 4 h O 1 §S * £ $ I 1 f | 8. =5 •* \ 'S ^ * - t fc K M •t m. S I - 1 1 I a £ 1 M \ S O V 1 11 * i, g 0. S & S a. I fi" s ^ | c ^ a7 -H -f 2 o to o . o S § -H^f 3? -H -jx s, i 5 S •+ Q c / H ° f£ H H H H e 8 | GD 3 - « ^ p; p- pq 70,000-ohm, carbon, #B 8,000-ohm, carbon, #B 90,000-ohm, carbon, #B i— i -» j-jsa 1 =«^ -H =»^ S =* - 0 =«= „ c c" r-e ?c" 0) -a) a 1 II i! -3 -rt b -3 S S « c 2 £ 8 ,;« g« S .2 » 2 H: ip (P c o i> 0 |z< fe IN Th IN CM CO CO % OS K 1 1 1 i t-i t- 1 1 O O •** ** CO CO g In § "i I '« 'tp i '§ 's mil Corps tock No. CO £ (S K rt S ffl « i 4 •*' e •41 t^ od op 00 00 tN OS CN CM CO en OS t^ CO CO CO CO § SI SI S S] !SJ SI SI SI SI I IN CM f CO CO CO CO CO ^z H, B ^ QH, QH, Q h •5 * Q *, Q ^ OH, P H, V O O - "OW O B ~ O f 3 CM"O B O B OW OB W pq ffl PQO_«P3O i,P5c 5 1 pq O P5 O ^ ffl O ffl O i-i •< 1-1 Q i- 6 PH HH* O o PH PH •"" > S •d o 3 o 1 § 1 1-t O | * wire- g 'i IN a2 Is" ^ +k ft ft C O CM o "> ^ - ca ik 7,000-ohm, ± 10 percent, carbon #BT-H. 00,000-ohm, taper C wire-- 'O :*t ,500-ohm, ± 10 percent, 1-w, wound, #BW-1. 00,000-ohm, ± 10 percent 1- bon, #BT-1. 50-ohm, ±5 percent, 10-w, ^ wound, #10-K. 00-ohm, ±5 percent, 10-w wound, #10-K. 'olume control, 500,000-ohm ,000-ohm, 2-w, lineal taper wound, with moisture se special shaft, \}i" diameter, ,700-ohm, 2-w, #BT^2 ,500-ohm. ±10 percent, 1-w wound. #BT-1. § S" 1 % K C el o -H i; .6 g" 5 "3 N S| CM "5 'S-S* *-< i— i csT CN ^ i^- i—1 CN u m t* L | J ~ ! 1 QJ ' ^» PH -W | 9 1 | a | 1 o 1 loo 1 ! S _o 1 1 •1 a ^ Q -2 *OQ | '58 'S S 1 "^, -2 5 7 1 pi « « pi £ O £ « I i CN Q O „. 0 „. g g o 1 co CM u5 —! i i ll $ i § T— t OJ S i CO CD CVI CO CN ^H CM 50 IN ,_l ^ o IN CO CO CD SI CO SI SI N X] Si SI S3 S) SI N CO CO CO CN CO CO CO CO CO CM CO* 58 "•5 w 3 O ^ 0 W Q2 Q H, o >-> Q ^ Q W 0 » O O 0 iH -H O W 0 K O W 0 O J PQ 35 O rt 33 O I4j i-^ o „. ffl O PQ O n ^ O pQ ffl PQ . ffl i— i ^J ffl IN ^H tN ^_ W |.| £ CN CN r- t~. || IN IN i t 1 CM CM ea IN I 1 1 1 • 1 e 1 S PH OQ ft OS ft a S S a tc ffl H H H 1 (. ( 0 H= 0} a "S <• *C cC • S ffl v 0 l "" iS m | g .2 3 %' > .£ ,j5 -c "c s 03 p •3 -9 •o « K p ^ £ o o o +-• fc. ^J tc t* M js S V a cS os CD C o "*-' C D C a 3 2 *•* is'? '.Q S 'S C Jt i O 0 0 C •" 3 c o ^ H H ft. =- J i J> £ i £ ff •S £ 14 1 1 'S P | i C ^ Igl fr. Jf" is 6 &T i ^ -M &S £ 6 r t ^ S co c co 03 . - ^J Q, (S "CO £, g CD ^- 6 r t 1 c ^_ =t^ §TS >r! •- v, 47 ma; sec. 6.3-v, 6 tropical treatment, #T 110-v. 25-ovnlfi. #T-460C v, 150-ma; 5-v, 4-am amp; tropical treatme cial leads, #1-46002. Description 1 £ 4,000-ohm, ±5 percent, wound, #10-K. CO «• C O 03 I£) "3 I 25-cycle). Power. 110-v. 60-cvcle: *-j" C §? O -H C. CO C a . ^ a" 1 3 •S H S ffl * CO •o M ""J 1 i & 0 ^" >•" ^ i £ -H* ft cc T£H 03 o -^> "^ 1 !«' o § CO +; . -g "O ^ *„ N o o o" jf E boiS >" 6 & o •- •s-2 ?•'? § tN ^ CC i-H I 1 1 4D te i h I CU X £ g G I 8 1 | ! ! o^. IN O! CO . i*a i ll f-. S CM 15 tl o CO CO CM IN e< i i^ 5 oo oc OS CD 01 o- 05 SI SI N SI SI S S 8 CO CO CO CO K N IN IN H . I1 Q -» o a Q >-» a Q a 1-5 p a 1-5 o a o a O ffi IN « V S ? •41 >H rt 1-1 t •g J S g "i d be a fe "5 h C |U 0 O g w *p o 'S C -3 S § 1 S io ^ ; M 2 3 3 i g 0 1 (S Pu 3 O 0 0 H E- PH r**^ PS E ^ ^ ^ g » ? 7 «J U5 IN M « ^ K IN IN CM •* iO O et l> OC ^000 co c .N - e oo « S? X X s 05 N § SI CO si Si (N R co CO n CO = CO Q >-» O W Q -» O M rt CO <1 fn CO CM Q >-» o a PQ Q^ co ^ ffl co - o III >-5 w o . Q .2 "S. 1 c IA g » |l J o: _g I "H ^ 3 .§ S « 5 J \ S. 2 1 • I |S i 1! a j || s _. -ii "S ."*" 3 •£ 3 *2 v 0 « 3 ^ '* 5 c C X t- § C 03 ,c Q Pn ft. K > P- W jj i Black bakelite, 2%" long, h" mount- ing hole, includes post, extractor, nut, and washer, #1075. Includes two 20-megohm, %-w resis- tors (13-1) and (13-2), brass shield tube 2]4" long, brass shield tube 1%" long, plastic insulating beads, special. Metal-fianeed. double-contact, bav- onet type, with solder terminals, #12. Tube, 8-prong, octal, 8-contact, retainer-ring mounting, mica- filled, for "32" stock, #SS-8. 4-cont,act. retamer-rme mountmer. Steatite, #SS4. Candelabra tvne. insulated slotted "» CM 1 1 1 1 §** 2^1 53 X ture bulb, Mazda #1000. TJH j^ O I Description » 1 I 1 C Q T) . "c 9 3 C. _Q X M M C a a ai 4 f _ a 1 > s|> 3 T-t 4 1 i | 3 S ft3 00 •B ^ 8 "S a 02 * S P ° 0 1. •S = *•* P 'S H | a 1 S fe » CO i— 3 ® C o c o •g o c co v. 0 ? cc i S ! 1 a £c OS 03 4 Is" i ^ I* oo cc 1O oc Q u5 2 oc I g 5 !• Q 1 .11 ^ O ic OC O: O3 00 OC ca IN n So oc ^ OS 1C C O •"* OC if N <1 ts; C^ tv a cc -^ cc IN IN c~ a S ll c I-S 1-s >-5 '-S ^ 5 O Q ^ Q -» a OB o a o Q -j Q ^ OB OB Q ^ 0 B B B O O e M •* Q •* "g^^gso $ ^gs Q SO 38 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 7 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le ) e CN ^H C >o "O — IN 03 -i" O5 1 — * IN 1 £• S K IN CO j- U5 1O W5 LO 1 IN Cv CS IN IN IN IN CM M 1 L, i- 1 3 g . 0 ) i i bi) b 0 bO 3 1 I !.i G b£ 1 etainer.. stment. a o3 .9 .£ '53 '5 •^ .s s 1 3 E en la be ° § 1 S i 1 1 4^ T*) X1 CO 3 _ JQ 9 ,J3 ^: on S .S £ I? Photot 1 02 t- P? fH ^ T3 o 1 8 o O. 1" 1 S 0 •a O 1 i O o s" T3 •? «" n" £ 1 of € •g-a 13 JQ S be 03 2 '3 4— «P d 13 "S •a S < 3 w ii w - §, OS 03 '53 '*. s 3 o3 ^M « . ^ 02 01 ^ 0) bO 53 •O oT 1-1 ^" 3 d 1 * 1 d "o 3 HD a J* C* x" K 13 ,0 co f* § "S DQ CO Q & O « s ^ 5, cu d d s. — 3 ; 1 0) tt QQ s. a •S a a. QQ X en V C — o3 c -"1 1 ^x T3 SS i M '3 co W r-L _id "3 _d I includes special. Molded g special. Molded bal 1 o) • special. 42 teeth, lef bakelite, i; a .—i ^ 5 x-f * 1 00 0) W 8 ft 1 •8 a o x ^ Q o; ° « Q k & i i i i i 2 •i 8 be b > i '£ .S .£ >>' *j ffl M , * 0 i t*4 1 I5 9 o9. . S o» o 3 c 3 . i 1 & 5k t ~ ts 1: af j t "« "a? 0) 1 5 'o 8 % £ S o S t 1 ) -^ hj II 1 J •£ 1 jJ.2 sic w ° s * • —' 03 •? 03 .~i O £ t- h "^ o 1 S ^ "* CQ PQ w o 1 I t 1 i i 1 i i j t SJ t 1 1 i * i I i ) o N' N OC IN" "5 "5 — C M CO •*' 05 i-H C4 CN CM s - s s s 5 S - g ^ -s >-» >-» >-s i W P I~5 P *-> tn w W « K O O O ffl 0 0 o w o o o O • o O ft< PQ rK co JS o- co P ce o> <: S p S s p So 1 •*< P CO <1 fH co <3 cc O co ^ -i-i « V t 73 *E "^ •3 15 "& e .2 CD C D i A a g J3 a | en t a a 9C a s s " 3 c 3 en — H — • —; — ffl C CD 3 *~^ s 0O -j _O 00 a 2 3 V ^ a £ a S ".2 > I i 3 3 '-2 0 ^ — -H O O co be O) '£ molded' ameter 1 •3 «> o 2? ^ 'S * $ g o a 6 £. o5 1 c h 1'^ m c-< Q n o> a V 73 45 O) 'T a .Q CO ^3 ° G d 15 "3 O o | O -o 1=3 11^ 73 * r ID M _ft "o _c. l-H * "3 ^ i *S o %" diameter stee S * be ^ c rs— Continued. 1 P, Tape drive roll sh diameter steel, 5. 3 .2 00 CO "be S P" ao,c ^ 1 ri"'4 _o ^ p II II S j h +" d o - 1— t ^5, 00 M o3 C bl d '^ cS iT C) .5 bi o a 3 bC 11 o ° -2 °! 5?; 7g| 2^3 CO o o3 £.*> |1 2 00 00 O — "C ^ . +3 tN""" CO w £ w 'E"' •* 15 =»= 0 » 1 > § S Io « P P P =t^ fS § 0 'a § 73 b£ be bo « O) s s a <= a a 04 •c -c "s _> en a "n 01 41 TO CO EABLE 1 asseml Cone d c! 0 , . ft . Rocker support i blv. £ £ a a o o h 1 t- IB 1 a B ^B co S '° a "2 1 O X! 3 o O EH a 02 02 w 1 1 | , , i ^ 1 1 1 i (J ^ o *< 1O CO CO ^- o tN ^ CO . o-0 CM 1 — 1 IN IN S 2 CO 1O CO I— 1 & LQ rt "5 u5 (6 3S P 1 p p ^ P 0 O p p p 1 o o | O C e § H i S | E» tN CN O •**! 5 3 3 ^ ^ 3 3 3 3 3 « £ - ."fl o. 1-3 >-) >— , >-) t-S >-s "~ ".- |l M H M a X w p -» w i O 0 O o 0 0 o 0 O o M o g W "SP /T] fi^ 00 ^ "gP _ CO O «§ KP ^ KP !>• ^ t^ H e 00 P 40 G e n e ra te d o n 2 0 1 4 -0 8 -0 5 0 7 :3 7 G M T / h tt p :/ /h d l. h a n d le .n e t/ 2 0 2 7 /u c1 .b 3 2 4 3 8 5 2 P u b lic D o m a in , G o o g le -d ig it iz e d / h tt p :/ /w w w .h a th it ru st .o rg /a cc e ss _u se # p d -g o o g le 00 0 >ft CC if" c ec IN t^ iO , , CC' "5 -p -T 1 CC F— i 1O 10 1O i^ CO iO i?7 CN CM IN J- t^ IN IN CM 01 0 h V a s t c oJ .> C "3 • 1 0 t- O< bearing, ressure rol mounting. o. a trol mechanis ieed control Si§ etainer, cone-d T OQ 43 ^ CJ o | EQ •g^ i [3 •o "o § § I J ^ . 5 t, C J t. •3 1 1 *" i: c. s o — - "oJ | & (H OJ 1 II = '3 « w | B ° aJ a o a V ti S H CD ^ -^ 3 Q, " C, 11 & O5 — » 5f « j « •* G) fl\ V 'O 03 O PH PH E* H (£. c5 •r. Pi K « « EH 10 00 -o s S t I "O 2 si ; ^ i GO 'X A . X 03 03 •5 ™? ^ 1 .S "2 « "1 •g „ +a i — T ^H o •3 ~- ^ K*" 1 ^ 03 3 CD 45 OQ O BS Q •* 1 •* ! .e 'bBi- g i ^ E 5 ^CJ o3 ~( 2. ao CD "5 S -. ^_" .^ = s o H" diameter x *%t" loni cial. Pressure roller, 134" x sheet steel, includes a 1" diameter x >16", sh sembled to hub, speci Speed control, includes: bearing, special. Speed control assembly. Speed indicator dial shaf o .-g •o" OD :}§ #G-165, special. ]':>" diameter, molded steel inserts, special. M (, CD S 1 I •S ^ "3 f J> 00 M *- CM ^ § If *|1 t-^l "3 — tD~ CD 03 O £ « "S =3 £ g £ : IE K tc £ I QJ Qj CC QJ 03 vec £ I 1 c 2 S x ; a i £ gp 3 E J> CC P ' i 5 2* CO m i 0 2 , f- i .1 60 "S t. 5 t • 03 S • v j_ _ — . 'C \ a H O """' ^ c3 Q v ^ ^ Cj >j c3 1 I S a t2 oS o> 0 •3 - o 03 ffl £ > CO CO tO >o co -T o o § § Q Q o o CM CM R o o A a •c 'C jg a .2 1 7 I be 09 -c T — 1 t> 03 £ ;o a. t- t "53 ft h g " C D ^ •j (J _' ^ *J ^j n £ "0 ft 1 ft | i1 j; 3 *• c 1 a ~t A a. .* c o! a V 'C * O a ^ •t _1£ 4 a t£ 9 CO S « o3 CJ OQ H E- ^H « 1 1 v en ' ^ ^ : ° 22 T3 ^ 1 ~=o -— C i. ""« CO C [2 c o . i «^ 5H33 «R ?— 1 ^ * g O ^ Q. C J5 S — b K ^ ft ^ bB b 'Si 3 3 .^1 _o bsl c 'C M _"3 s c a" 'C ID "!- °-gT 1 P, S —" > c T O , g « 31 3 4-- *x ™ O 3?": Descripti as tiii! .p +a O5 ""^ ,O CO !=-& 1 2 1 1 * w- N -Q ** i en V -T M'S (H ^ C" "« III -. 3 ^ o 1 Ui CD ClT K "o 1 o cy fi fc< C * | £ 1 3 e- ll Si 4 "diamel a OS ^ 13 T3 • -C TT3 § « i. i en 73 o r2 i ^4 o! ™ o ^s a t> . 1 1 2 s !s 1 33 H H iR b ffl P^ V j ! | 1 S 4 c * w | S a ei a % • CO "S bo X •c . t q 1 1 ~' £ "S 1 S pQ -4- 1 1 'S '-. -E (S S co" •o "° A GO 1 > cc i i g 1 i 1 i 3 §0 cc 1 o 00 tN i CO ^ 5 OC 4 CC Ur t 02 O I-H 1 - Q 5 8 i IN IN C c c 1 IN Q Q •4 C C tN "2 «Q ft o "o c £ t3 .Q . c O .E a « JQ ~ x IN c x* .£5 *e 1 1 > Oscillator audio tn O Vernier bil c o c Amplifier right-ha Amplifier left-han i •g •g ft IN 0 o c . I ft 1 I QQ 11 ? a QQ c? 03 i £ „ _^Io ! „ ^ 4i 1 I)) OJ 1 ! 1 T! OJ J ^ I 1 "3 1 3 3 QQ "" S 1 1 -C CO ^ ill' S .8-3-. =koL t.* #DH28. 9 "" C^ 03 er metal, v 0 ffl i £ [S ! 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