Pioneer SX-939 (1974–1977)
A stereo receiver from Pioneer’s 1970s lineup, delivering 50 watts per channel with low distortion across the audible spectrum.
Overview
The Pioneer SX-939 is a stereo receiver manufactured by Pioneer from 1974 to 1977. With a build weight of 36 lbs 8 oz, it reflects the robust construction typical of mid-to-late 1970s receivers.
Specifications
| Power output | 50 watts per channel minimum continuous at 8 ohms, from 20Hz to 20,000Hz, with no more than 0.5% total harmonic distortion |
| Total harmonic distortion | 0.5% (at rated output) |
| Frequency response | PHONO: 20Hz to 20,000Hz ±1.0dB; AUX, TAPE: 10Hz to 70,000Hz +0 -1.0dB |
| Signal-to-noise ratio | PHONO (MM): 70dB; AUX: 90dB |
| Input sensitivity | PHONO (MM): 2.5mV; AUX, TAPE: 150mV |
| Speaker impedance | 4 to 16 ohms |
| Dimensions (W x H x D) | 19-7/16" x 6-3/4" x 15-3/8" |
| Weight | 36 lbs 8 oz (16.6kg) |
| Semiconductors | 2 FETs, 48 transistors, 27 diodes, 1 LED |
| Original price | $549.95 |
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