CEM3340

[Paul Schreiber]

> >
> > Does anyone know if the 3340 has any known failure modes? I have two
> > 'dead' ones from my systems. One has no temp compensation and has lost
> > its triangle output at high frequencies. The other is randomly playing
> > higher notes, but stays roughly tracking the 1V/oct. It is the CEMs; all
> > other circuitry has been cleared of misbehaviour.
> >
> According to my Memorymoog service manual (March 1983 edition), there were
a run of CEM3340s with datecode 8226 which will not hold the oscillators in
tune.  Remedy is to replace the 3340 with another datecode and re-calibrate.
That's all the details it provides.
>

The story on this particular date code is that they drift when running with
a +15V supply, as the MM uses. Other
synths that use +12V to +9V supplies do *not* have this isue and the part is
fine.

Paul S.