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Pioneer SX-3900

FM Quartz Locked Stereo Receiver (1980-81)

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Pioneer SX-3900


The Pioneer SX-3900 is an AM/FM stereo receiver incorporating a non-switching amplifier and digital, quartz-servo locked tuning.


Tuning range: FM, MW

Power output: 120 watts per channel into 8Ω (stereo)

Frequency response: 7Hz to 80kHz

Total harmonic distortion: 0.005%

Damping factor: 60

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 86dB (MM), 105dB (line)

Output: 150mV (line), 1V (Pre out)

Semiconductors: 15 x IC, 6 x FET, 89 x transistors, 62 x diodes

Dimensions: 526 x 176 x 452mm

Weight: 20kg

Accessories: FM T-type antenna

Year: 1980


service manual   English - yam_man_dan

instruction/owners manual   English - dpeters30

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Reviewed Nov 10th, 2015 by C.A. Ray

I purchased my Pioneer SX-3900 new in 1981 in Corpus Christi, Texas. As it is now 2015, and I've just had it back from a Pioneer Service Centre that specialised in vintage equipment. I thought I'd have it checked out to see if might require some updating (it has never missed a beat...). My system has never been 'over-played', just thought I'd get it checked. They informed me 'this receiver was thoroughly inspected and they could find no evidence of overheating and they only had to re-soldered a couple of wires (due to removal/inspection). And performed as good as the day it was manufactured'.
They tested the re-assembled unit only to determine it produced 142 watts at 8 ohms, with only .00325% distortion on the three frequencies tested.
Not bad for a 30+ year old Receiver...
Too bad build quality of that era isn't practiced now, but that's capitalism. But then again, nobody would need to replace their HiFi's...not to forget the SX-3900 is BIG and heavy.
Sadly, I've just purchased a complete well cared for Pioneer 'Urushi' Reference system, so looking for an appreciative new 'Keeper'.

Reviewed Sep 23rd, 2015 by mobay

This is a large and heavy silver faced Pioneer unit that is really a good looking and performing heart for a mid level stereo system. The Fluorescan meters are absolutely stunning to view and the polished aluminum is classy and of such high quality to enhance any environment. Separate TREBLE and BASS turnover rates for more control over the tone of music, FM de-emphasis, Pre-AMP in and out , and a whopping 120 watts out. The FM section is a sensitive 5 gang receiver that will pick up weak stations and really play strong ones well. My only complaint is the damping factor could have been higher at the power level that this receiver is rated for. Other than that this is a great unit if one gets it for under $160 -$200 and in good condition.



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