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Old 2nd Dec 2021, 10:34 pm   #46
shaunpw
Triode
 
Join Date: Nov 2021
Location: Nottingham, Nottinghamshire, UK.
Posts: 17
Default Re: Quad 34 preamp volume knob clicks

The pcb is fibreglass but the component side has a pale blue laquer on it that over time causes a type of black wire condition.
Either shorting or removing C89 does nothing to effect the -0.41mv on IC27.
I see what you mean about the 10k and 100k resistors, that has probably been leading me up the garden path !
I have a few more things to try yet, I'm replacing the rest of the caps on the inputs and the 4 zeners on the radio input.
Is there a way to "block" the signal from the Disc input at IC22 perhaps, I want to eliminate that part of the circuit.

Thanks
Shaun.
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