Vintage Synth Repair

They are still available, I buy them from Wes Components in Sydney, Roland Australia still 
have them or a close sub, or if you get really stuck there are probably a dozen subs if you 
look in a substitution book.

--- In vintagesynthrepair@yahoogroups.com, "gil_we" <gil_we@...> wrote:
>
> Well said. That was indeed one of these transistors !
> 
> Any known substitutes for these ?
> 
> 
> 
> --- In vintagesynthrepair@yahoogroups.com, "thirteentech"
> <thirteentech@> wrote:
> >
> > Look for a leaky transistor in the chorus circuit. The general
> purpose NPN and PNP 
> > transistors that Roland used in so many machines seem to fail quite
> often. They begin to 
> > leak and cause pops. I come across them with leakage problems in
> TR909's all the time, in 
> > JP6 power supplies, and Juno 106's. They are 2SA115's and 2SC2603's.
> From memory 
> > these are used on the Juno chorus/output board as well.
> > 
> > 
> > --- In vintagesynthrepair@yahoogroups.com, "Scott" <painintheamp@>
> wrote:
> > >
> > > --- In vintagesynthrepair@yahoogroups.com, "Dorus Manassis"
> > > <thorosm@> wrote:
> > > >
> > > > --- In vintagesynthrepair@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > > > >
> > > > > Is there any particular component on the Juno 106
> amplification/chorus
> > > > > circuit that could cause one side to make a "tick" noise with
> every
> > > > > LFO loop ? 
> > > > > 
> > > > > It may sound louder on one side compared to the other, if that
> > > helps...
> > > > > Replaced the BBD's but no change. Thanks !
> > > > >
> > > > 
> > > > i think i have the same problem with my MKS-50....
> > > > 
> > > > i would be interested to know too....
> > > >
> > > Does that part of the circuit have a potentiometer?
> > > Most discrete chorus circuits Ive seen have a pot that needs to find
> > > the "sweet spot" where the oscillator works but doesnt overwork
> > >
> >
>