[sdiy] Memorymoog VCO trim

[Barry Klein]

Hello all,
Just a little report on the MM repair:
I replaced all the Scale and Range trimpots with the Murata parts.  They too 
are 25 turn parts.
I would say that it did not make a huge difference.  Noticeable improvement 
but not as good as
I would like to have.  The adjustments just are inherently minute.
All oscillators autotune now - a CEM3310 was bad that forced the output VCA 
to only work in AS mode
and prevented the Autotune on one oscillator somehow.
I was prepared to have to recoat the keyboard contacts with silver from the 
rubber keypad repair kit but in this case noted that the gold contact 
surfaces on the pcb had a little orange residue on them.  I put a touch of 
Brasso on a wet paper towel, wiped, and they all cleaned up nicely (follow 
with wipe of clean wet then dry paper towel).
I have 2 oscillators that have some audible low frequency modulation.  Not 
due to the VCO chip
as did not follow in a chip swap. The two are on different voice cards.  Not 
immediately apparent what the cause is.
Annoying.
Man this synth gets hot!  A switching power supply would be a nice 
improvement in this and the weight (huge xfmr in MM).

Barry