Note
QST, Aug 1946, p. 145.
Concord catalog 9-47, p. 154.
Lafayette-Concord (1949 #949), back cover.
Hallicrafters advertised the S-47 as an "AM-FM receiver for specialized installations," and that it would have "numerous applications in homes, schools or public institutions..." and that "...the S-47 lends itself perfectly to 'custom' installations of your own choosing--such as specially designs cabinets and bookcases or built-in sound systems for fine homes."
Five bands provide coverage for AM (540 to 1700 kHz); FM (88 to 108 MHz; and three shortwave bands: 5.8 to 18 MHz, 9 to 12 MHz, and 15 to 18 MHz. The overlap of the shortwave bands is hard to explain.
The big gimmick with the S-47 is pushbutton tuning. There are five buttons for AM, and five more for FM. These presets are mechanically driven, as opposed to some electronic method--pushing the button mechanically moves the dial pointer. This system was used in a number of car radios of the period. Additionally, there are separate tuning dials for FM and AM/shortwave.
The set includes separate bass and treble controls, and a control for AM selectivity. There is also a phono input for use with a record player.
There may have been two versions of the S-47 as the one shown here is different than the one in Chuck Dachis' book--a more elaborate escutcheon and different knobs.
Also includes a three position bass control, four position treble control, and a phono input jack.
Rack mountable.
Coverage (MHz):
540 to 1720 kHz
5.9 to 18.2
9.0 to 12.0
15.0 to 18.0
88 to 108
IF: 455 kHz, 10.7 MHz (FM)
Modes: AM (FM)
No BFO
No ANL
No AVC
AFC (FM only)
No internal speaker
Audio out: 10 watts, 500 Ω
Requires external speaker (500-600 Ω impedance)
Power: 120 VAC, 180 watts
Tubes: (1) 5U4, (2) 6V6, (2) 6SQ7, (2) 6J5, (1) 6AL5, (3) 6SG7, (1) 6SH7, (1) 6J6, (1) 6BE6, (1) 6BA6
