> I understand the log scaling, but I have 3 other identical A-131 VCAs
> purchased at the same time - same version - which still work properly.
> The initial gain control, when fully open, in the two faulty modules
> barely allows any signal through at all - closer to 0.05 than to 1.0.
>
> I am hoping it is not the CEM chip since I assume that it is not
> possible to buy these anymore.

You may ask Paul Schreiber (www.synthtech.com) if he still has some CEM3382
available.

You can find out very easily if the CEM3382 are the problem by moving the
chips.

Best wishes
Dieter Doepfer