UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

shaunpw · 1st Dec 2021, 10:28 am

I have the Quad service data manual which shows how to make up a test din plug with 1k resistors, is that the one you mean ?

When the voltage on the outputs of ic27 is 0.0v, the volume knob is silent, and yes I was removing the shorting links before moving on.
C89 & 90 are not linked, I removed the links from all shorted caps.
I still need to trace the voltage back.
I'm kind of understanding how this thing works now and i'm sure i'll find the problem (especially with all the help you have given me !)

I'll post again when i've fitted the new op amps.

Thanks.

1st Dec 2021, 10:28 am	#31
shaunpw Triode Join Date: Nov 2021 Location: Nottingham, Nottinghamshire, UK. Posts: 17	Re: Quad 34 preamp volume knob clicks I have the Quad service data manual which shows how to make up a test din plug with 1k resistors, is that the one you mean ? When the voltage on the outputs of ic27 is 0.0v, the volume knob is silent, and yes I was removing the shorting links before moving on. C89 & 90 are not linked, I removed the links from all shorted caps. I still need to trace the voltage back. I'm kind of understanding how this thing works now and i'm sure i'll find the problem (especially with all the help you have given me !) I'll post again when i've fitted the new op amps. Thanks.