Vintage Synth Repair

Update:

I've been able to tune both oscillators together, but I can't seem to
get the synth to be in tune with true C.  That is, even using the
tuning pot on the front panel, I can't get the synth to be in tune
with another keyboard, a guitar, or another instrument that is already
in tune.  This will be an issue if/when I plan on recording.  Any
suggestions, other than continuing the knob twiddling? (which i have
done a lot of)  Thanks.

Dustin