1969 AM/FM Stereo - sound only on one side - Team Camaro Tech
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post #1 of 9 (permalink) Old Apr 27th, 08, 02:59 PM Thread Starter
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Tony
 
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1969 AM/FM Stereo - sound only on one side

All,
I have a 1969 blue light stereo that plays only on one set of speakers - one channel on the front speaker harness and one channel on the rear harness. The other two channels seem to produce no sound at all. Any advice would be much appreciated!

Thanks,
Tony
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post #2 of 9 (permalink) Old Apr 27th, 08, 03:25 PM
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Re: 1969 AM/FM Stereo - sound only on one side

Have you tried to tie in an old speaker from the garage with wires tied into the side thats not working, just to confirm its the radio? I dont know the odds of blowing speakers on front and back, one side, but a 3rd speaker would prove its the output or the speaker. Im sure you have tried also, turning the left/right balance knob?

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post #3 of 9 (permalink) Old Apr 27th, 08, 04:19 PM
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Re: 1969 AM/FM Stereo - sound only on one side

can be the speaker.........did you check?

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post #4 of 9 (permalink) Old Apr 27th, 08, 04:25 PM
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Re: 1969 AM/FM Stereo - sound only on one side

Is it the left side out or right side out?

If it is a complete side out, good chance an audio output transistor is blown - that would be the most obvious but other things in the mix also.

If L & R have sound, but it is just individual speakers out, then good chance the fader pot on the front is defective.

Need more data, but assuming your wiring and speakers have been checked.

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post #5 of 9 (permalink) Old Apr 27th, 08, 04:46 PM Thread Starter
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Re: 1969 AM/FM Stereo - sound only on one side

Guys,
Thanks...it works now! The channel must have been cutting out due to bad reception. I hooked up an antenna and all four channels are playing now. Unfortunately the volume control and fader sound like a lightning storm when you rotate either of them. I could use some guidance on how to clean these pots. Thanks, Tony
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post #6 of 9 (permalink) Old Apr 27th, 08, 06:43 PM
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Re: 1969 AM/FM Stereo - sound only on one side

Radio Shack should have a rattle can of contact cleaner with an extension tube.

With the radio out, shoot the spray into any small holes in the pots and the open area where the lugs come out of the pots. Rotate the pots aggressively while spraying.
Spraying anywhere else is useless.

If you really want to get brave you can do a better job by taking the pots apart and cleaning the carbon off the wafers with a pencil eraser - don't recommend this way though if you are not comfortable doing that.

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post #7 of 9 (permalink) Old Apr 27th, 08, 08:30 PM Thread Starter
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Re: 1969 AM/FM Stereo - sound only on one side

Thanks Greg, I'll get a can of the contact cleaner tomorrow and give it a shot.
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post #8 of 9 (permalink) Old Apr 28th, 08, 04:46 AM
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Re: 1969 AM/FM Stereo - sound only on one side

Or just twist the bejesus on the knobs to 'sand' the carbon away.

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post #9 of 9 (permalink) Old May 5th, 08, 02:37 PM Thread Starter
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Re: 1969 AM/FM Stereo - sound only on one side

Update: I sprayed a couple shots of CRC contact cleaner in the end of the shaft and twisted the volume control 15-20 times. Sounds a lot better. There's still a little 'fuzz' when the radio is initially powered up (capacitors?) but the scratchiness is gone. Thanks guys.
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