One observation which might be worth considering before you do anything else
and that is make sure the PSU is generating clean DC voltages to the rest of
the P6, calibrated and within spec. You will need to consult the service
manual and someone who owns an oscilloscope to get this right. Settings
drifting over time and logic randomly latching is never a good sign.
However, if it is just the MG which goes crackers then make sure the MG rate
pot reliably delivers between 5 and +5 volts when fully clockwise. Give it
a good waggle! Failing that you could try switching IC20 and IC21 (they are
socketed) to see if the fault shifts to the PWM rate. I would not be
surprised if the fault is somewhere on the 367. Call in as you proceed...
Cheers,
Andy
On 21/12/2009 14:27, "f115@rocketmail.com" <f115@rocketmail.com> wrote:
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> In recent years I've noticed that my P6 takes quite a while to to warm up and
> get in tune. I read some older posts here and it sounds like 10 seconds is
> normal. Mine takes longer, maybe a minute, but it's more like a slow VCO LFO
> rather than individual notes being out of tune. My gut would tell me to start
> replacing capacitors but I haven't pursued it and I'm not sure how it would
> affect the sound by doing that.
>
> Also - generally speaking the synth out of tune and is off by a semi-tone or
> so. I've got my tune knob all the way to the left and I imagine it'll get
> worse over time. Note for note the synth is ok so the calibration appears to
> be normal, but as I said, overall it's noticeably out of normal range.
>
> Thanks everyone!
> (Hammering you guys with questions today) :)
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