Vintage Synth Repair

I rebuilt a 106 recently and cleaned the chips so you needed sunglasses to look at them, even under most all of the IC pins.  Still, I had some leakage on a couple of channels.  While I cannot find the schematics now, I remember that I found the input to the VCA and using some 100K - 200K range resistors, perhaps to V+ but maybe ground (don't remember!), I managed to bring the amp back to just the point of cutting off and stopped the leak-through.  I remember selecting the highest resistor that would stop the leakage on each channel with the problem.  I recall that I got to this by measuring the voltages on the control pins to the 80017A, although I also recall that they might be current-controlled inputs.

If you need me to dig into the schematics and chip block diagram I can maybe provide some more detailed guidance, although I do not have the synth anymore to confirm any story I might be telling from memory!

I purchased an 80017A from synthparts.com  (email synthparts@...). Doug was the guy's name. Service was fine enough.  (I can not say if the part I got from them had the leakage problem or not since I did not keep track of that one vs. the other 5 in my 106.  There were 2, maybe 3 parts that I had to make this mod to when I was finished re-assembling everything.)

Good luck,
Hugh

--- In vintagesynthrepair@yahoogroups.com, Terje Winther <terje.winther@...> wrote:
>
> Yes, they are still around.
> A bit slow business, but very good products.
> 
> 
> Den 7. april. 2013 kl. 17.26 skrev Nicolas:
> 
> > Hi,
> >
> > I used to order some 80017A chips for the Juno-106 from Analogue  
> > Renaissance because they are great and reliable.
> >
> > But recently it seems very difficult to contact them by email to  
> > make an order. The didn't replied to my last emails.
> >
> > Are they still in business?
> >
> > If no, is there an alternative
> >
> > Thank you!
> >
> > Nicolas
> >
> > 
> 
> Terje Winther
> terje.winther@...
> http://wintherstormer.no/
>