I'm wondering if there are any big differences between the two that would make the 9-90-01 module unsuitable for a 9-57-VCR project. I've been comparing photos of a 9-90-02 to my -01. The biggest difference I see is a couple more metal film resistors and a different pot on the -02. I have extra 9-57 modules I could strip for the adapter board.

IIRC 9-90 boards went up to -04.
IIRC one had a pot that a shaft plugged into, another just
a screwdriver pot. Also had an 8 pin IC for the osc.
I THINK the 9-57-VCR used an -03 board. We did put a
few in.
Best is find one & check it for any other changes that may
have been made. With all the flat chassii out there I am
surprised none of us has one.

73 Zeno:smoke:
LFOD !