Discussion about the Korg PolySix synthesizer

Hi,

I've recently acquired a Korg Polysix (mk 2 with no KLM-396 board),
which was in pretty bad shape. I've changed the battery, which luckily
had barely leaked at all, and recalibrating it has gone fairly
smoothly. However, I've run into some trouble tuning it.

The problem seems to lie with VR2 on the KLM-366 board (the overall
High Freq. tuner). It doesn't cause any change in pitch when it is
turned, although having checked it with a multimeter, it appears to be
working fine. As a result, I have had to use VR11 on its own and can
never get the pitch of any oscillator lower than a top C#.

I have seen other reports of this sort of problem, although no
solution. All other controls seem to work as expected, and I have been
able to get the lower 3 octaves more or less in tune with each other,
although not to the expected pitches.

Any ideas?

Thanks in advance,
Martin

A friend of mine has the exact same problem on his board, we haven't 
managed to find the source of the problem yet though.


--- In PolySix@yahoogroups.com, "martinwigy" <martinwigy@...> wrote:
>
> Hi,
> 
> I've recently acquired a Korg Polysix (mk 2 with no KLM-396 board),
> which was in pretty bad shape. I've changed the battery, which 
luckily
> had barely leaked at all, and recalibrating it has gone fairly
> smoothly. However, I've run into some trouble tuning it.
> 
> The problem seems to lie with VR2 on the KLM-366 board (the overall
> High Freq. tuner). It doesn't cause any change in pitch when it is
> turned, although having checked it with a multimeter, it appears to 
be
> working fine. As a result, I have had to use VR11 on its own and can
> never get the pitch of any oscillator lower than a top C#.
> 
> I have seen other reports of this sort of problem, although no
> solution. All other controls seem to work as expected, and I have 
been
> able to get the lower 3 octaves more or less in tune with each 
other,

> although not to the expected pitches.
> 
> Any ideas?
> 
> Thanks in advance,
> Martin
>

If you cant tune your P6 then it is probably the OPTO on the 
filter/Osc pcb. I've fixed about 5 of these units and this is always 
the problem

--- In PolySix@yahoogroups.com, "martinwigy" <martinwigy@...> wrote:
>
> Hi,
> 
> I've recently acquired a Korg Polysix (mk 2 with no KLM-396 board),
> which was in pretty bad shape. I've changed the battery, which 
luckily
> had barely leaked at all, and recalibrating it has gone fairly
> smoothly. However, I've run into some trouble tuning it.
> 
> The problem seems to lie with VR2 on the KLM-366 board (the overall
> High Freq. tuner). It doesn't cause any change in pitch when it is
> turned, although having checked it with a multimeter, it appears to 
be
> working fine. As a result, I have had to use VR11 on its own and can
> never get the pitch of any oscillator lower than a top C#.
> 
> I have seen other reports of this sort of problem, although no
> solution. All other controls seem to work as expected, and I have 
been
> able to get the lower 3 octaves more or less in tune with each 
other,

> although not to the expected pitches.
> 
> Any ideas?
> 
> Thanks in advance,
> Martin
>

Hello,
i have the same problem with VR2 and i have already changed PC-1 and 
R93 (VT5*** + 1k2 R93) ,q3, ic17, ic18, ic19, but it doesn't cause 
any change in pitch when it is turned.
Where is the solution ?
Any help please.
Thanks in advance
Emidio

> turned, although having checked it with a multimeter, it appears 
to be


--- In PolySix@yahoogroups.com, "martinwigy" <martinwigy@...> wrote:
>
> Hi,
> 
> I've recently acquired a Korg Polysix (mk 2 with no KLM-396 board),
> which was in pretty bad shape. I've changed the battery, which 
luckily
> had barely leaked at all, and recalibrating it has gone fairly
> smoothly. However, I've run into some trouble tuning it.
> 
> The problem seems to lie with VR2 on the KLM-366 board (the overall
> High Freq. tuner). It doesn't cause any change in pitch when it is
> turned, although having checked it with a multimeter, it appears 
to be
> working fine. As a result, I have had to use VR11 on its own and 
can
> never get the pitch of any oscillator lower than a top C#.
> 
> I have seen other reports of this sort of problem, although no
> solution. All other controls seem to work as expected, and I have 
been
> able to get the lower 3 octaves more or less in tune with each 
other,

> although not to the expected pitches.
> 
> Any ideas?
> 
> Thanks in advance,
> Martin
>