2. amps-preamps
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Audio with sound off

I have a Pioneer QC-800a preamp when toe volume is off I still get audio.
When I turn the volume up a little one side has sound the other does not.
But when I turn up a little more sound comes through both sides.
Anybody ever hear pf this problem, I thought it was dirty controls but even after
cleaning them still have the same problem.
Does anyone have any thoughts on this problem
128x128myboys2603
jea48
4,425 posts
 

Sounds like a dirty volume control potentiometer.

With the preamp turned off.

You might try rotating it fairly fast back and forth several times through its' entire travel.

If that doesn't help you will have to clean it with a good contact cleaner. That is if you can get access to the dual pots on the back side of the face plate of the preamp. 

myboys2603's avatar
myboys2603 OP
5 posts
 
That was the first thing I tried. The volume control is very clean no resistance turning, glides so easy
erik_squires
16,056 posts
 
It still sounds like a bad pot. :) Not all dirty pots can be cleaned successfully.
jea48
4,425 posts
 
That was the first thing I tried. The volume control is very clean no resistance turning, glides so easy

You can't feel if it's dirty just by rotating it.

Pull the top cover and look to see if you can see the dual gang volume control pots. If not you might have to pull the bottom cover and see if you can see it from the bottom.


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