Discussion about the Korg PolySix synthesizer

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Mike Thompson wrote:
> Ok thanks.  It makes sense I guess, but I'm probably going to try tuning it one more time 
> because I really don't feel like putting any more effort into this keyboard if I can help it.  I 
> just got an OB-8 so I really don't need the P6, but I like the arpeggiator and SSM sound so 
> that's why I keep it around.  Any idea how much that part cost anyway?
> 
> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> wrote:
> 
>>Hi,
>>
>>search the message archive for a message from Peter Andersson on
>>Tue Feb 10, 2004 3:30 pm (msg #646). He had the same problem and
>>found a replacement part for the opto isolator. I downloaded the
>>data sheet then. Now I have uploaded it to the files section of
>>the list.
>>
>>Cheers,
>>
>>Johannes
>>
>>
>>Sam Larch wrote:
>>
>>>You can check the message history to find that a few P6 owners are having a
>>>tuning problem.  The most likely culprit, it seems, is that an opto-isolator
>>>(HTV-P1501) has failed which in turn is rendering the tune-high useless...so
>>>the board won't tune correctly.
>>>
>>>I've been unable to find a replacement opto-isolator - or a datasheet even.
>>>
>>>If you - or anyone else for that matter - finds a supplier for these ICs, or
>>>has a replacement circuit (even better) please let us all know.
>>>
>>>
>>>
>>>
>>>On 6/25/06, Mike Thompson <tubmyk2@...> wrote:
>>>
>>>
>>>>  I recently had my Polysix KLM-367 board serviced through Old Crow
>>>>(replacement, rather)
>>>>and just got it back a few days ago. Unfortunately I needed to
>>>>re-calibrate the oscillators
>>>>and tune them since it sat for so long not being used. But the tuning is
>>>>still off - not really
>>>>a seperate oscillator problem so much as I can't get it to the right pitch
>>>>using the tune
>>>>knob. Even at the max to the right (sharp) I cannot get the unit to hit a
>>>>perfect a-440.
>>>>And just to clear up the dummy-factor, I even made sure that the tune knob
>>>>was set at
>>>>dead-center when I began the oscillator tuning, so i would have
>>>>flexibility in both
>>>>directions if the tuning shifted. I am about to re-do the process but I am
>>>>curious if
>>>>anyone else has suggestions as to why this may happen even though I kept
>>>>the pot at the
>>>>center? Any help is appreciated, thanks.
>>>>
>>>>~Mike
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>[Non-text portions of this message have been removed]
>>>
>>>
>>>
>>>
>>>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
>>>Yahoo! Groups Links
>>>
>>>
>>>
>>> 
>>>
>>>
>>>
>>>
>>
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> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> Yahoo! Groups Links
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