Note
QST, Jul 1940, pp. 2–8.
QST, Nov 1941, p. 105.
Lafayette catalog number 82, p. 115.
QST, Apr 1943, p. 2.
Radio Craft, Nov 1944, p. 68. (ad -- "the radio that never slept")
QST, Apr 1945, p. 1 (reference to SX-28A)
When people think about a Hallicrafters receiver, the SX-28 may be what comes to mind. It is one of Hallicrafters' most popular and iconic products. Introduced in the summer of 1940 and sold through WWII with the last units made in 1946. Versions of the SX-28 were also sold to various elements of the government, including the military and the intelligence community. The SX-28A, ruggedized for use by the military, was designated AN/GRR-2.
Outwardly, at least on the front panel, all of the SX-28 versions are identical. The SX-28A includes a rear panel AC line fuse. The main differences between the 28 and the 28A/28-FCC are in the design if the RF section. Specifically, the sensitivity and selectivity have been improved with the use of what the company called "micro-set" permeability-tuned inductors. The inductors, trimmers, and associated components for each RF stage are mounted on small, individual sub-chassis, easily removed for servicing.
Not to be confused with the visually identical SX-32.
The receiver was available with three optional speakers; the tabletop R-12-T, the gigantic free-standing console R-12, and the not-quite-as-gigantic R-8, as shown in the July 1940 issue of QST.
Estimates of the number of radios made range from about 27,000 to 50,000. Probably closer to the lower number, based on a database of serial numbers.
Coverage: 540 kHz to 43 MHz
IF: 455 kHz
BFO
ANL: three-stage Lamb-type
S-meter
No internal speaker (500 or 5000Ω terminals are provided)
Audio output: 8 watts
Bass boost switch
Main tuning dial lock
Crystal filter
Variable IF selectivity (six steps from 12 kHz to CW)
Audio output: 8 watts, 500/5000 Ω
Power: 120 VAC, 120 watts, or 240 VAC with optional universal transformer, or 6 VDC with optional "vibrapack"
Tubes (15 total): (1) 5Z3, (2) 6V6, (1) 6SC7, (1) 6J5, (1) 6H6, (2) 6AB7, (2) 6B8 (2) 6SK7, (1) 6L7, (2) 6SA7
References
Recording War News with the SX-28. Radio News, Feb 1943, p. 18.
Updating. CQ, May 1959, p. 48.
