Vintage KR-7600 receiver balance knob problem

[jwags81818]

Picked up a vintage receiver and was testing it and the balance knob appears to do NOTHING. I rotate it back and forth and it has no effect. Mono button is not pressed, tape monitors are set to source. All controls I believe are in the correct position. But I am playing with only one rca cable hooked up to the right channel input and yet the unit plays out of the right speaker no matter where the balance is set to. I have not cleaned it yet but could a dirty control really do this? Very Odd...

 

[Galu]

Could someone have previously disabled the balance control in the belief that it is better to remove it from the signal path?

Or could a previous owner have bypassed the balance control because it was faulty?

 

[Mark Tillotson]

It may be the type where the wiper goes to ground, and have lose continuity? If so then a signal on one channel will leak to the other side.

 

[rayma]

Very odd, you'll have to do some signal tracing.
I presume the volume control does still work normally.

But dirty corroded controls can indeed do about anything,
so clean everything well to avoid wasting time checking around.

 

[huggygood]

Or the amp lost one side and the outputs were bridged so that L and R produce sound....

 

[chrisng]

It may be the type where the wiper goes to ground, and have lose continuity? If so then a signal on one channel will leak to the other side.

http://akdatabase.org/kenwood KR-7600 Service.pdf