Oscillator Bleedthrough on Mini

[Mark McLemore]

On Tue, 23 Jun 1998, SynthDog wrote:

> Any ideas on eliminating OSC Bleedthrough on a MiniMoog.
> (old Rev Oscillator board)
> 
> Conditions:
> When All 3 Osc. are switched Out and Volumes are at "0" and all Filter
> Controls are at "0" and output is 1/2 to full triggering a Key will fire
> the Amp Env and all 3 osc can be heard pre-filter.
> 
> I have not yet torn it apart to analyze this behaviour (I have the Doc's),
> but plan to soon. I just thought it wise to consult the masters first!

I had this problem a few years ago (serial #5247) -- I ended up soldering
a huge electrolytic capacitor (2200 uf) across the back of the filter
board, from a suitable V+ point (near the top of the transistor ladder)
to ground.  Haven't had the problem since.

cheers,
Mark McLemore                   mgm at eden.com