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Discussion about the Korg PolySix synthesizer

Index last updated: 2026-04-28 23:40 UTC

Message

Re: Needed: calibration procedures for 366B

2006-04-29 by lionelcassin

I don't know if he's still in the business. He rebuilt mine more than
a year ago. 

The deal was that you must send him a board and then he rebuilds it. I
don't believe he builds them from scratch.

Tx
LC

--- In PolySix@yahoogroups.com, "gil_we" <gil_we@...> wrote:
>
> I tried to contact crow a few times as for buyin a naked KLM-367A 
> board but got no answer.... is he still making those ?
> 
> 
> --- In PolySix@yahoogroups.com, "lionelcassin" <lionel@> wrote:
> >
> > I managed to cobble together a working Polysix from 2 dead units 
> and a
> > rebuilt 367 from Old Crow. The oscillators sound pretty in tune, so 
> I
> > left them alone.
> > 
> > I'm a big fan of self-oscillating resonant filters, so I fiddled
> > around with the frequency filter VRs to get all the filters tuned to
> > the same note. Then I screwed around with the KBD TRACK (VR5) and 
> KBD
> > TRACK OFFSET (VR13) on the 367, knowing that if I sent everything
> > screwy, I could refer back to the calibration manual I downloaded 
> from
> > Old Crow's site. 
> > 
> > But when I went to the manual, it says to test CN05-06 (which I take
> > to mean Connector 5, Pin 6) and make sure you get +1.8V. When I test
> > that pin, I get anywhere from -5 to +5 volts depending on the 
> setting
> > of Keyboard Track pot on the front panel. The manual doesn't mention
> > KBD OFFSET.
> > 
> > So my KBD TRACK, KBD OFFSET and FILTER F0 and OFFSET pots are 
> probably
> > set way out of factory standard and I have no way to get home.
> > 
> > Thus my questions - 
> > 
> > 1. Is the calibration manual off the Old Crow site the right manual 
> to
> > use for a 366B? If not, where can I get the right one? 
> > 
> > 2. If the calibration manual I have is the right one, what am I 
> doing
> > wrong?
> > 
> > 3. Can one get tuned filters over the entire keyboard range, or is
> > that practically impossible? The best I get was 1 - 2 octaves in 
> tune.
> > It sounds ok, but it could be better.
> > 
> > 4. What is the difference between VR7 (filter offset) and VR8 
> (filter f0)?
> > 
> > My overriding goal is to get the unit back to factory standard. Any
> > help towards that end would be much appreciated. 
> > 
> > Thanks
> > Lionel Cassin
> >
>

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