[sdiy] ARP Quadra - Gilbert Cells VCAs?!?

Michael E Caloroso mec.forumreader at gmail.com
Mon May 7 02:44:38 CEST 2018

F) Unusual application of an instrument grade circuit in a musical
instrument whose tone can benefit from some circuit distortion.


On 5/6/18, rsdio at audiobanshee.com <rsdio at audiobanshee.com> wrote:
> What are you saying?
> A) Standard VCA chips have level-dependent distortion
> B) Gilbert Cell Multipliers have less distortion
> C) Gilbert Cell Multiplier distortion is not level-dependent
> D) All of the above
> E) Some of the above
> On May 6, 2018, at 11:58 AM, Michael E Caloroso <mec.forumreader at gmail.com>
> wrote:
>> Last night I was browsing the service manual and was amused to find
>> that ARP implemented discrete Gilbert Cell Multipliers for the VCAs in
>> the Quadra.  Usually they're found in bench measurement tools, this is
>> the first time I have seen them used in a synth.
>> I can certainly appreciate the decision: with a machine comprising a
>> string machine, lead synth, bass synth, and poly synth there is a LOT
>> of potential hot signal passing through those VCAs.

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