Vintage Synth Repair

hello,
many thanks for the helpful email.
i have forwarded your email to my tech.
i hope that soon my SEM will be in fine condition
again.
best regards,
bakis.





--- mantridcat <mantridcat@...> wrote:

> Sorry it took so long to get back on this, I was
> gigging & ingnored my mail for a 
> week or so. Ok, here goes...I checked back on the
> SEMs  (about 6) I've fixed 
> that had this problem-sure enough, one required both
> A23 & A24 replaced for 
> NO modulation.The other SEM had 2/3 to near-full 
> modulation and looking 
> closely at my notes for the client I saw I had
> indicated A24 as the cause.
> of that issue due to "liquid ingress"-The client had
> spilt a pint of best 
> Guinness**  as I recall, so the A24 issue does
> indeed look like a bit of a red 
> herring for  our friend Bakis !  Ahh... must update
> my memory-chip!!
> Thanks Mike!
> 
> Regards,
> 
> Mantridcat
> 
> 
> 
> **-Not the strangest by any means....I've had a
> Farfisa Compact organ that 
> kept detuning intermittantly-the cause was a live
> caterpillar pupating between 
> the pillars of the main tuning-choke!!
> The 're-housing' of a small family of mice I found
> living happily in a Hammond 
> A101 is a story for another day......
> 
> 
> 
> --- In vintagesynthrepair@yahoogroups.com,
> WeAreAs1@a... wrote:
> > 
> > In a message dated 8/15/05 1:05:33 AM,
> "mantridcat" <mantridcat@y...> 
> > writes:
> > 
> > << Another likely cause is A24 -This is an LM741
> common or garden op-
> amp and 
> > I have had this cause no or full modulation when
> it goes belly-up. >>
> > 
> > Hello Mandricat,
> > 
> > Thanks for your help and experience on the
> subject.  Nevertheless, I can't 
> > readily see how a failing A24 could cause full
> modulation.  It could definitely 
> > cause no modulation, or could cause a huge static
> pitch offset if its output 
> > went high or low, but how could it increase
> modulation, if there is no 
> > modulation signal placed at its input?  Have you
> really seen this before as a 
> failure 
> > mode?  If so, what am I missing?
> > 
> > Mike B.
> 
> 
> 


Bakis Siros
Parallel Worlds / Polariton
Athens-Greece
[Doepfer_a100] group owner
http://www.shimarecords.co.uk
http://www.ward12.com


	
		
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