[Collins] 75s-3 RF gain and muting problem - Solved the good and the bad

[David Vest]

Looks like I found the problem with my 75s-3,  it appears the RF gain
control (10K Pot) has gone bad.  After checking the circuit and convincing
myself that everything else looked ok, removed the pot from the front panel
and took it loose and it did not look quite right on the meter.  I then grab
a 10K pot out of the junk box and hooked it up and everything fell into
place.

 

So there's the good, found the problem, now the bad is where can I find a
replacement?

 

BTW with the junk box pot in the rig the bias voltage came back down to the
expected -65 volts.

 

Thanks for the input.

 

Dave