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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

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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Hi again,

It would seem that you posted the problem here also. With your kind permission, I will repost my excerpts of my responses that others may benefit on similar concerns.

A. Most current receivers no longer include a PHONO input. Perhaps what could be done is to purchase a phono to line level pre-amplifier to go along in your purchase for a new receiver.

I was made to understand that the Pioneer SX-1600 is prone to speaker output problems which could either be:
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Either should be relatively easy to work on and perhaps you can try the services of a locally available qualified electronic technician since the repairs would not be too specialized. The service manual may be of help (or at least a schematic , they may be downloaded from here and here).

B. To recap what you need is a receiver that can accommodate:
4 - Pioneer S-DF1-K (15-100W, 8 ohms)
1 - Pioneer PD-F407 25 Disc CD Player
1 - Pioneer CT-300 dual tape deck
1 - Kenwood KD-491F turntable

C. Possible choices are (keeping in mind that the power output should be less if not equal to 100 watts and a turntable/phono input):
i. Onkyo TX-8522 Stereo Receiver;
ii. Yamaha RX-397 100 Watt Natural Sound AM/FM Stereo Receiver;
iii. Sony STR DE695 AV receiver;
iv. Teac AG-790 200 Watt Stereo Receiver;
v. Denon AVR 888 - AV receiver - 7.1 channel.

Some of the above also includes feature(s) to hook up to your video system. Some may even require a fifth speaker (subwoofer).

Incidentally, you can also choose another brand/model even without a turntable/phono input. As initially posted, a turntable/phone to line level pre-amplifier is only required. Here are some examples:
a. XP200 Turntable Preamp - Nano Series;
b. Pyle® Pro PP999 Phono Preamplifier;
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d. Radial J33 RIAA Turntable Preamp Direct Box

Good luck with your project.

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