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Pioneer SX-950

AM/FM Stereo Receiver (1976-78)

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Pioneer SX-950


High power and extraordinary FM sensitivity in an advanced circuitry AM/FM receiver.

How much AM/FM receiver can you get for a pleasantly modest investment? Try the Pioneer SX-950 on for size.

This distinctive package of plenty includes up-to-the-minute circuitry throughout its handsome construction, and then gives plenty of power to boot: continuous power output of 85 watts per channel min RMS at 8 ohms, from 20 Hertz to 20,000 Hertz with no more than 0.1% total harmonic distortion.

But big power is only one important attribute of this new receiver - you also get an FM front end that performs with outstanding stability and sensitivity, thanks to the use of a pair of dual gate MOS FETs in its RF amplifier and mixer, an advanced FM IF section that includes three 2-element ceramic filters and a large scale integrated circuit, plus a multiplex section for FM stereo broadcasts that uses the innovative and advanced phase-locked loop IC for excellent separation characteristics.

The result is a flawless kind of sound that is unmatched in tonal quality by any comparably-priced receiver now on the market, plus the radiant good looks of Pioneer design and human engineering. The SX-950 by Pioneer: Something extra everywhere.


Tuning range: FM, MW

Power output: 85 watts per channel into 8Ω (stereo)

Frequency response: 15Hz to 40kHz

Total harmonic distortion: 0.1%

Damping factor: 25

Input sensitivity: 6.5mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)

Signal to noise ratio: 75dB (MM), 90dB (line)

Output: 150mV (line), 30mV (DIN), 1V (Pre out)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 4 x FET, 4 x IC, 55 x transistors, 36 x diodes

Dimensions: 526.6 x 173 x 411.5mm

Weight: 19.1kg

Accessories: FM T-type antenna


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re: SX-950

Blew the FU4;1 Amp fuse in my 950. Can someone tell me is this is a fast or slow blow fuse? Thanks in advance.

re: SX-950

I just purchased one of these beauties. Should the power (on/off) lever move as lightly as all of the over levers, or does it typically have more resistance? Comments appreciated. Jon

re: SX-950

I got a SX-5590 (=SX-950). The power lever has the same resistance as all the other levers.

re: SX-950

The picture I believe showed the line voltage fuse accessable from the back of the case. But mine was inside the case accessed from the bottom panel. It is 6A-125V and mine was blown! I sure hope that is all that is wrong! But I have sprayed everything down with Deoxit D5 which goes really fast so a little goes a long way.
My Pioneer SX-737 I will open next because I seem to have the left side speaker just humming and not picking up a signal. Hopefully it is either a fuse, or the incoming signal was bad because I was testing it with an old DVD player on CD. These two tuners really put out some great sound when they are working well. I am a Noeb on this stuff, though I have had verious elecrical classes over the years. My old way was just cleaning and taking a eyeglass and searching for cracks or burns. But I need to get familiar with finding leaky pots and checking resistors.

re: SX-950

I'm sure now that three years after this post, the unit has been serviced.
But that receiver blew a 6 amp main fuse - meaning that something is seriously wrong with the receiver - merely replacing the fuse without properly troubleshooting the reason is not wise.
Because there IS a reason why fuses like that blow.

re: SX-950

My left stereo channel goes out after unit warms up. Sound still comes out in mono mode, but not stereo. Anyone know what I can do to address this problem?

re: SX-950

I realize it's been a loooooong wait...however...I encountered the same problem n what follows was my fix!!!
I recently pulled my 950 apart for cleaning n repairs n discovered n the power supply[AWR-101] a multitude of problems. Q1 was completely shorted...Q4 was burned out n ZD12 was burned up as a result of [I'm guessin'] Q1 n 4. Because Q4 was burned out, all the current from Q2 was flowin thru R16 causing it to always run hot n eventually burn out. When I got the unit 'bout 15 years ago, it was burned out n ZD12 was the culprit.
Check your voltages from pins 13, 14 n 15, if they're running excessively high then your problem lies in Q2 n 4...
the smart thing would be to check ALL voltages from the pins on [AWR-101]. Theses old transistors have a tendency to go bad after 40 years or so anyhow.
Long wait, but hope it helps

parts list of power amplifier ass'y (AWH-050)

resistors listing, page 80, VR1 and VR2 shows 1K-B; it should be 10K-B.

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