[sdiy] Memorymoog VCO trim

[James R. Coplin]

I had a similar issue with mine which spurred a massive overhaul a couple of
years ago.  I replaced every cap in the synth, replaced all sockets,
headers, and connectors with new gold connectors, and had all new cable
made.  I also replaced all the trimmers as mine were getting dead spots.  It
took many, many hours but it sounds and tunes perfectly now.  I'm glad I did
so I don't ever have to do it again...

James R. Coplin

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Work is the Curse of the Drinking Class
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> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> bounces at dropmix.xs4all.nl] On Behalf Of Barry Klein
> Sent: Monday, June 16, 2008 1:02 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Memorymoog VCO trim
> 
> Hi all,
> I have been occasionally working on the MM+ I just purchased.
> Trying to get 6 tuned oscillators but only get 5.  When I go back to
> check
> usually I find one that is off by >2 digits from 7F.  Is that what
> would
> cause the tune failure or something else?  The oscillator that is off
> is not
> consistantly the same.  I also see a problem where every 6th note does
> not
> play in this test state.
> 
> This is the 3rd MM I have worked on and (as before) the trimpot
> adjustments
> are damn touchy.  So much so that I wouldn't want to even bump one that
> was
> tuned....
> Is this due to old trimpots - do new ones make life much easier here?
> Anyone tried installing digital pot IC's?
> What improvements have you made to your MM's to either make calibration
> easier and more stable or even just mods you have made to increase
> capabilities?
> 
> Barry
> 
> 
> 
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