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Pioneer SX-750 Old School Need Help

I have a Pioneer Stereo Receiver Model No. SX-750 and it just recently started distorting the sound to the speakers hooked up to the left speaker outputs and made them sound like they were blown. But the speakers on the right hand side sound fine and when I disconnect the speakers on the left and hooked them up to the right they worked fine. Any ideas?

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  • Anonymous Dec 06, 2008

    Have a Rotel RA-01 and any speakers attached to left speaker output channels sound like they are blown. Same speakers attached to right side output on both A and B channels are fine.

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I agree with Gene Wells. My SX-750 had exactly the same problem some years ago. I replaced the balance potentiometer (ACV-135) with an original part that I bought from eBay and distortion disappeared. Very very seldomly also the Tone ON-OFF switch causes the same type of distortion but for the moment I can eliminate the trouble by simply moving the tone switch up and down. No need to fix yet. Because it is a tough work to reach to that area of the equipment. PIONEER SX 750 RECEIVER PARTS control balance 250K ACV 135

Posted on Jan 13, 2015

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Check the speaker wire. Sometimes it can just be loose in the terminals and cause distortion. I have had the problem before.

Cheers!
DellMan94

Posted on Jan 12, 2009

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If you are using a turntable, check the rca jacks for corrosion. clean them with fine sand paper. as well, check the pin contacts for the cartridge, if they get corroded, they will offer distortion as well.

just some other things to look for

hope that helps

Posted on Mar 26, 2008

If you are using a turntable, check the rca jacks for corrosion. clean them with fine sand paper. as well, check the pin contacts for the cartridge, if they get corroded, they will offer distortion as well.

just some other things to look for

hope that helps

Posted on Mar 26, 2008

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It could be a dirty control or switch, working them back and forth could prove that. Other than that, It's likely bad outputs. A unit that old may have transistors for outputs but might be IC's. Transistors can be tested with an ohm meter to see if they're good or not. Also if it has transistor outputs, they may have a small value resistor on the Emitters, check those as well.

Hope that helps...

Geno

Posted on Mar 07, 2008

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