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
LFOD !