For Hallicrafters, the "X" in the model number indicates the crystal filter. Note the errors in the 1966 Lafayette catalog ad below which lists the S-129 as "SX-129". That small price difference for what I perceive as a big loss in capability would explain why there are fewer S-129 sets. The S-129 was priced at $164.95, only $15 cheaper. Another difference is the first IF tube which for the S-129 is a 6BA6 in place of the 6EA8.Ĭost of the SX-130 in 1965 was $179.95. The S-129 is a cost-reduced version that eliminates the S-meter and crystal filter and, of course, the broad and sharp selectivity settings afforded by the crystal. The rectifier is half-wave using a silicon diode. Tubes are 6DC6 for RF amp, 6EA8 as mixer oscillator, another 6EA8 for first IF and crystal selector, 6BA6 as second IF, 6AL5 as AM detector/noise limiter, 6BE6 as BFO/ product detector, and 6GW8A as combination audio preamp and output. The smaller circular dial on the left is for main tuning. The long horizontal slide-rule dial is bandspread. Bandspread for the SX-130 is calibrated for the 80, 40, 20, 15, and 10 meter ham bands. The small gap in coverage from 1610 to 1725 KHz is necessary because the IF is 1650 KHz. The SX-130 is a 4 band communications receiver covering AM broadcast from 535 to 1610 KHz and shortwave from 1.725 to 31.5 MHz. Hallicrafters SX-130 receiver Hallicrafters SX-130 receiver
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