Vintage Synth Repair

Check the CA3080 chips.
But beware: sometimes putting in a modern CA3080 will not help: you  
need a 3080 tested to be within a specific range.
Since you mention that noise works: I have had success swapping the  
3080 from the noise to the VCO, and putting in a new 3080 into the  
noise section.

> Now my trusty old Micromoog from 1976 has failed and I am at loss to  
> localise the problem. Noise, filter, and modulation work just fine,  
> but the actual sound-producing oscillator is dead. I have heard that  
> some people have fixed their micromoogs by replacing some op amps,  
> but I really would like to know where to start looking. I have the  
> service manual and have replaced a couple of bits listed as possible  
> reasons in the troubleshooting guide. This resulted in the filter,  
> VCA, and modulation coming back to life, but no oscillator sound.
>
> It seems to get more complicated next, so I would very much like to  
> hear if someone of the listees has fixed the oscilltor and what was  
> the problem in your case...
>
> cheers and thanks in advance,
>
> Ami
> 
>

Terje Winther
terje.winther@...
http://www.wintherstormer.no/