[sdiy] schematic for Moog 901 VCO

[TJ]

> I'm looking for the schematic for the Moog 901 VCO - not the 901 A, B
> or C - I have these already in an old service manual. The 901 combines
> them ( A B and C) and removes some of the redundant circuitry. Seems a
> bit rare.......
>
> Anyone able to help? I saw a remake of these here
> http://www.moogmodular.com/9501/
>
Hey Dave,
  It is difficult to see from those photos, but I have an old 1969 901  
here. It is simply just a 901A on the one side mounted upside down, so you  
can adjust the trimmers from the left. And a 901B on the other side, and  
there is no 901C involved. I'm not aware of any circuit differences, other  
than the front panel attenuators for the four waveforms? Perhaps you are  
thinking the 921 oscillator that has additional circuitry for the auxilary  
output section?
Terry