[sdiy] schematic for Moog 901 VCO

[Dan Snazelle]

Man those "moog music" moog modular re-issues have some of the most beautiful circuit boards i have ever seen....they look like they were really well made

anyone know the story on those or why Moog (the current moog) doesnt make those anymore?

thanks

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> To: dave.leith at gmail.com; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] schematic for Moog 901 VCO
> Date: Sat, 21 Mar 2009 03:06:59 -0500
> From: daytona at verizon.net
> CC: 
> 
>> 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
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