Note
Lafayette-Concord (1949 #949), inside back cover.
QST, Jan 1950, p. 7.
Allied Radio catalog 1951 (copyright 1950), p. 136.
Allied Radio catalog 1953 (copyright 1952), p. 34.
The SX-71 is a notable communications receiver from the post-World War II era. Produced from 1949 to 1954, it was a high-performance, double-conversion superheterodyne receiver for bands above 4.7 MHz, with single-conversion below.
The receiver covers a broad frequency range, from AM broadcast and shortwave (538 kHz to 35 MHz) to the 6-meter ham band (46 to 56 MHz), with a separate bandspread dial for amateur radio frequencies. The receiver includes a crystal filter for superior selectivity.
The radio required an external speaker, with the matching model being the R-44B.
The unit's complexity and performance made it a popular choice for hobbyists and serious shortwave listeners.
Provides reception of AM, CW, and NBFM over the entire range. One RF and three IF stages yield sensitivity of about 1µV overall. Bandspread calibrated for 80 40 20, 10, and 6 meters.
In early units (until about 1951) the main tuning and bandspread dials were white. In subsequent models these were with black. Cabinet is steal gray with chrome trim and a piano hinge top.
Coverage: 560 kHz to 34 MHz, and 46 to 56 MHz
IF: 455 kHz and 2.075 MHz
Requires external speaker
BFO
ANL
Crystal filter
S-meter
Calibrated bandspread
Audio output: 3 watts, 3.2 or 500 Ω
Power: 120 VAC, 90 watts
Tubes (14 total): (1) 6BA6, (1) 6C4, (1) 6AU6, (1) 6BE6, (3) 6SK7, (1) 6SH7, (1) 6H6, (1) 6SC7, (1) 6AL5, (1) 6K6, (1) 5Y3, (1) VR-150
