Discussion about the Korg PolySix synthesizer

I had the same problem on my Korg Trident - the dual transistor 
responsible for the scaling was bad, the interval was about 3 halfs 
instead one half between each note to the one following it. That's 
why I still assume the problem lays there... Make sure you followed 
the instructions correctly. I presonally never replaced that one on 
the P6 but this is what the experience of other people shows. I 
wouldn't touch any tuning VR yet. Let us know how you proceed.



--- In PolySix@yahoogroups.com, "David Davis" <feline1@...> wrote:
>
> I haven't tested anything further yet, 
> do you think maybe I should open it up again and make 
> some more adjustments?
> Perhaps even just flick the "stretch tuning"/"equal temperament"
> switch and see what difference that makes?
> 
> Is it possible I just didn't solder the new vactrol in well?
> (it was quite fiddly to get at some of the pins, since
> it's a bigger component than the original dual-inline IC)
> Or would it not work at all in that case?
> 
> --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> >
> > Are all VR's functional on that board ?
> > 
> > 
> > --- In PolySix@yahoogroups.com, "David Davis" <feline1@> wrote:
> > >
> > > Well, it took a little while to get hold of a replacement
> > > opto-resistor, but I fitted it last night...
> > > pretty confident I got it soldered in right, 
> > > but no joy :-(
> > > The power-up autotune routine completed much quicker, 
> > > but the semitones were still all stretched to hell.
> > > Looks like my Polysix is gonna have to make a trip to
> > > www.synthrepairservices.com ...
> > > 
> > > --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > > >
> > > > Let us know if it helps...
> > > > 
> > > > Had the same exact problem on my Trident and it indeed was 
the 
> > expo 
> > > > coverter.
> > > > 
> > > > Thanks ;)
> > > > 
> > > > 
> > > > 
> > > > --- In PolySix@yahoogroups.com, "David Davis" <feline1@> 
wrote:
> > > > >
> > > > > Thanks very much for the advice - 
> > > > > since that only involves replaceing two components on the 
> > boards, 
> > > > > even my wretched soldering skills oughta be able to handle 
it - 
> > > > > and it won't cost more than a few pounds...
> > > > > Will definately give it a try!
> > > > > DAVID
> > > > > 
> > > > > --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > > > > >
> > > > > > Check the Files section as for how to replace the 
optocoupler.
> > > > > > 
> > > > > > Do not touch ANY of the trimpots, as once you replace the 
bad 
> > > > part it 
> > > > > > should stay in its normal tunning.
> > > > > > 
> > > > > > 
> > > > > > --- In PolySix@yahoogroups.com, "David Davis" <feline1@> 
> > wrote:
> > > > > > >
> > > > > > > After many years faithful service, my polysix seems to 
have 
> > > > > > developed
> > > > > > > a tuning problem :-(
> > > > > > > 
> > > > > > > Usually when I first switch it on, and initially hit 
the 
> > keys, 
> > > > the
> > > > > > > VCOs swirl around in pitch for about a second? (I 
presume 
> > > > that's 
> > > > > > some
> > > > > > > kind of autotune routine or sthg.)
> > > > > > > 
> > > > > > > However, recently, when I turn it on, this doesn't 
happen, 
> > and 
> > > > the
> > > > > > > oscillators stay at some kind of wierd tuning (all the 
> > notes 
> > > > seem
> > > > > > > stretched out, the octaves are about a third or more 
off 
> > pitch!)
> > > > > > > 
> > > > > > > One time, I left it for about 20 minutes and when I 
tried 
> > > > again, it
> > > > > > > was back to normal.
> > > > > > > But yesterday it just remained in this wierd state.
> > > > > > > 
> > > > > > > Any suggestions to make it behave?
> > > > > > > I made sure that the pitch bend wheel was centred at 
power 
> > up.
> > > > > > > The VCOs are switched to "stretch tuning" inside, but 
> > that's 
> > > > never
> > > > > > > been a problem before, and this is orders of magnitude 
more 
> > > > > > stretched
> > > > > > > than that.
> > > > > > > 
> > > > > > > It's not a NiCd battery calamity, as my Polysix was 
> > upgraded a 
> > > > few
> > > > > > > years ago to a "PolysixM" (with lithium battery) 
(Johannes
> > > > > > > Hausensteiner's mod)
> > > > > > > 
> > > > > > > DAVID
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>