View Single Post
Old 4th Dec 2021, 10:29 am   #55
Craig Sawyers
Dekatron
 
Craig Sawyers's Avatar
 
Join Date: Nov 2010
Location: Oxford, UK.
Posts: 4,942
Default Re: Quad 34 preamp volume knob clicks

Another downside of reducing the input resistors to 1K on radio (and presumably aux too) is that you will get a reduced signal level. Most sources have a series resistor to ensure stability into cable capacitance, of between ~200 ohms and ~1k. Giving between -1.6 and -6dB.

When I had a 34, I can recall absolutely no clicks from the volume control at all.

C30/31 100uF should take out any small DC offset going into the volume control. In principle of course this should be non-polar since the offset polarity is not known.

Likewise your suggested 33uF input capacitor.

Craig
__________________
Doomed for a certain term to walk the night
Craig Sawyers is online now