[sdiy] Jp-8 head scratcher

[Colin f]

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Maarten Halmans
> Sent: 07 November 2013 10:32
> Subject: Re: [sdiy] Jp-8 head scratcher

> Duty cycle is 50% and the levels are the same. If I set 
> scaling and tuning a bit off, it retunes it to the exact same 
> error. So it seems something is switched off or on when it 
> goes into autotune. Tunes it neatly, leaves autotune and 
> switches something on or off again. Leaving me with the pitch 
> error. Because I already disconnected all summing resistors 
> which carry modulation sources and disconnected the x-mod 
> vca. All supply voltages stay the same before, during and 
> after autotune.

So you have *only* the KCV input driving the VCO pitch ?
Even after it leaves auto-tune ?
And it still has an error, even if you move the voice card to a different
location ?
!
Could there be some kind of HF oscillation coming from somewhere that's
affecting the tuning ?

Cheers,
Colin f