View Single Post
Old 3rd Dec 2021, 1:47 pm   #51
shaunpw
Triode
 
Join Date: Nov 2021
Location: Nottingham, Nottinghamshire, UK.
Posts: 17
Default Re: Quad 34 preamp volume knob clicks

So i've spent a few more hours chasing my tail today !

I have found where this -41mv originates, it does indeed come from the Radio input section. There are so few components for that input too and replacing them has not helped.
I have also removed all the through pins associated with that input and linked the points with wire effectively removing the pcb from the equation (this pcb is double sided but relies on pins to link the connection to the 2 sides)
I can change the -41mv to a lower voltage by altering the value of R13 but its not a fix.
I have more or less given up trying to fix it.

I have connected the 34 back to the amp and even with the "stray" voltage, the original fault has almost gone. The clicks are worst on the Radio input but you can hardly hear them now unless you crank the volume all the way up and then it only happens once (before, its was constant and even at low volume)
When CD is selected, the clicks are even less and almost unnoticeable.

To me this is as good a fix as I'm going to get and for the sound quality, its a small price to pay.

Thankyou for everyone's time and effort in getting me this far (especially Mooly).

Shaun.
shaunpw is offline