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Vintage Synth Repair

Index last updated: 2026-04-28 23:41 UTC

Message

Re: Moog Rogue pitch bend

2013-07-11 by duncan

(schemo added to files section)

--- In vintagesynthrepair@yahoogroups.com, "duncan" <ferrograph@...> wrote:
>
> have you got the schematics? all of the pitch adjustments are summed onto the 1st input of ICU2A.
> 
> the pitch wheel has +12 & -12 connected to its two ends, & the "wiper" goes via two diodes (to create a dead-band) & R25 (620k) onto the summing buss & thence to U2A.
> 
> so.... find R25 & reduce its value to (say) 330k, & see if that does what you want. I put a trimmer across mine so I could fine-tune it to +/- an octave.
> 
> hth-
> duncan.
> 
> --- In vintagesynthrepair@yahoogroups.com, "Nicolas" <nico678@> wrote:
> >
> > Hi everybody,
> > 
> > Is there any way to adjust the range of the pitch bend on a Moog Rogue?
> > I would  like to adjust so that it bend up to one octave when when it is full up. Same thing in the opposite direction.
> > If there is no adjustment, is there any mod that can be done on the circuit?
> > Thank you!
> > 
> > Nicolas
> >
>

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