Quote:
Originally Posted by Radio Wrangler
... Little subtleties like this tend to get lost as time goes by.
It can be overcome by adding a pair of small capacitors, but first you need to know of the need.... then you need to know the value. It might be helpful if someone with an original amplifier in working condition measured it ...
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That's such a good idea David that Keith Snook did it quite a few years ago now - reported in some detail, with examples of possible replacements here
https://www.keith-snook.info/quad-ii...amplifier.html. I take my hat off to him.
If further support is needed for this, I see that when Quad re-released the amp as the Quad II Classic they fitted polyprop capacitors in the C2 and C3 positions, each with a 22pF disc ceramic from the output wire to ground.
Cheers,
GJ