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
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