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Old 23rd May 2008, 10:44 PM   #21
VivaVee is offline VivaVee  New Zealand
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When you say the "switching bank ICs", do you mean the 4066's? If so, what did you use as a replacement
Hope is not a reliable design discipline
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Old 24th May 2008, 07:54 PM   #22
johnm is offline johnm  United Kingdom
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I'm afraid I was asked politely not to reveal the brand/model no. of the IC chips in question when I upgraded my Quad 34. However I can say that I bought them from the chap who runs the following business:


He was/is extremely helpful, and knows ALOT about the Quad 34 and upgrades. He may have changed his position now and wouldn't mind revealing what chip he uses - see what he says. His prices are very good as well if you want to buy just the ICs from him.

Hope this helps!

- John
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Old 25th May 2008, 05:53 AM   #23
VivaVee is offline VivaVee  New Zealand
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Assuming that the replacements were pin-for-pin compatible then there are not many alternatives. The MAX4066A springs to mind. I designed a piece of test gear not so long ago where I used the standard 4066 switches in the protoype then replaced those with the MAX4066 for production.

There are distinctly better switches available but not in a pin-compatible package. A redesign of the cct could reasonably use newer devices with markedly lower distortion and better crosstalk.
Hope is not a reliable design discipline
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Old 16th March 2010, 04:35 PM   #24
Zigis is offline Zigis  Latvia
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Anyone now Quad 34 preamp RV2 and RV3 pots value? Tilt and bass regulators.
In schematics are only RV2 and RV3 a and b, no nominals.
My idea is building original tilt and bass schematic from scratch.

Maybe someone of Quad 34 owners can see inside or measure both pots resistance?

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