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I have a question about the balance on my Pioneer stereo

I have a vintage Pioneer SX 450 stereo. It has always worked great but I moved about 3 years ago and it's been boxed since then. I just plugged it in and the right speaker is very crackly. I replaced brand new speaker wire and the polarities are all in line. The left side works perfectly. The speaker is not the problem as I switched them and the right balance is still off. When I disconnect the speakers and listen through headphones everything sounds good. I pulled the knobs and top off and sprayed some 3M dust aerosol dust remover everywhere which didn't seem to help. Thank you for any input.



karodimitrov's picture

Re: I have a question about the balance on my Pioneer stereo

I have the same problem with my Technics.The problem was in the headphone jack.

Re: I have a question about the balance on my Pioneer stereo

That receiver does not use a switching type headphone jack, so that can't be the problem.

Re: I have a question about the balance on my Pioneer stereo

Since headphones sound OK I would suspect a poor connection to the speaker terminals or the A/B speaker switch. Try cleaning this switch.

Re: I have a question about the balance on my Pioneer stereo

Thanks for all of the input guys. So how would I check the speaker connections or clean the A/B switch? I don't know much about this stuff at all. Thanks again.

Re: I have a question about the balance on my Pioneer stereo

Testing with headphones at times can be decieving, because you aren't supplying an 8 ohm load when you use them. So at times you may not notice the distortion on headphones that you do on speakers. And this unit doesn't use a speaker protect relay which can cause this problem at times.

My suggestion is to clean all controls and switches, after looking for Johnnysans suggestions.
If distortion is still there, i would suspect output or driver board issues.