Hi

Thanks,

It's come back and it's still out by 10% at two octaves above middle c and 20% two octaves below middle c. Andy emailed me to say it was spot on when he recalibrared it.

Mark

--- In Doepfer_a100@yahoogroups.com , <yahoo@...> wrote:
>
> > Hello Mark
> >
> > On 21.05.12 22:21 , mark wrote:
> > > so I'll see what it does when it's back in my system
> > Just a word about that: The tuning and octave tracking is depending on
> > the powersupply voltages. You may adjust a VCO in a foreign system to
> > about 99% of its abilities, but the last 1% is only reachable, if you
> > adjust it connected to the powersupply with which it will work in the
> > future.
> >
> > So I suggest, that you bring at least that rack to EMIS, where the VCO
> > is attached to.
> >
> > Florian
>
> I don't think that this applies to the A-111-5 because it has additional
> internal voltage regulators for the CEM3394 available. The internal supplies
> for the CEM3394 are +8V and -5V. Even all tuning controls for the VCO
> (octave switches, tuning control at the front panel, internal offset
> frequency trimming potentiometer) are connected to the internal +8V
> and/or -5V. But for other VCOs it's correct - provided that not the
> A-100PSU2 is used. The A-100PSU2 is adjusted in the factory to +/-12,00V
> within +/-10mV so that the supply voltage tolerances should not affect the
> VCOs. But for simple supplies (e.g. with 7812/7912 regulators only or for
> switching power supplies) the supply voltages may affect the VCO tuning.
>
> Best wishes
> Dieter Doepfer
>