AM/FM Stereo Receiver (1974-76)
The Pioneer SX-939 is a highly versatile, big powered FM/MW stereo receiver.
The unit features a parallel push pull OCL power amplifier with less than 0.3% total harmonic distortion, a completely new PLL MPX circuit, frequency linear 4-gang variable capacitor and a newly developed IC AM.
It also has a twin control system and duplication switch, and Dolby adapter in/out terminals with switch.
Tuning range: FM, MW
Power output: 70 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 40kHz
Total harmonic distortion: 0.3%
Damping factor: 45
Input sensitivity: 2mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)
Signal to noise ratio: 65dB (mic), 70dB (MM), 95dB (line)
Output: 150mV (line), 30mV (DIN), 1V (Pre out)
Speaker load impedance: 4Ω (minimum)
Semiconductors: 3 x FET, 4 x IC, 57 x transistors, 39 x diodes
Dimensions: 520 x 175 x 420mm
Accessories: FM T-type antenna
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Reviewed Jan 22nd, 2016 by Stildawg
Had my SX 939 for a year now. It sounds great and has a warm sound to it. It does get loud when needed and I can't say enough about it. It looks really cool to, I had it re capped and new LEDs. It is a pain to recap there are a ton of capacitors.
Reviewed Apr 09th, 2014 by starbender
I always wanted x2x - x3x series receiver. Finally got SX-939. Build quality is impressive. These series has nice warm-mellow sound. Tried three different speaker. Especially bass response is unbeatable. If you are looking for a tube-like sound and eye candy looks, this is the one!