SergeModular

Question to the technically-savvy crowd: When I use my UAP as a dual
VCA, I hear a sound leak from the right-side VCA, even when I turn
the pan-fade knob fully counterclockwise. Please advise.

Is this mostly at hi frequencies? Then it could be a grounding problem.
From EGRES: (I can quote it cuz I wrote it!)
"I experienced a strange oscillator bleed through that I thought was
something I just had to live with, but turned out to be fixable. With
1/4" cables going from my UAP to my mixer and NOTHING patched, I would
hear the oscillators going very faintly, especially at the higher end of
the audio range. So any unpatched oscillators would be making an
unwelcome contribution unless I tuned them to sub-audio A call to Rex
fixed the trouble. Cutting, relocating, and resoldering the ground wire
on the 1/4" jacks changed the ground path. Apparently, this wire was
acting as an antenna and picking up the radiated audio frequency energy
from the oscillators. If you're ordering a system, tell Rex about any
grounding considerations; that way he can take care of this before
shipping. If you have this problem, call Rex before cutting any wires!"


If it's NOT this problem then you need to have the vca readjusted.
There are a set of trimpots inside for zeroing CV and audio rejection.
If you have a soldering iron and a mighty hairy chest I can give you
some instructions. Otherwise I'd send it to Rex or a competent tech for
tweeking.

Take care

John P.

cuari7 wrote:

Ufff! Mental fatigue showing. Please, no soldering needed to adjust
the vca. Many apologies. All you need is a good nylon diddle stick. A
small flat blade screwdriver would work too but you need to be careful
to not short anything out.

John Papiewski wrote:

Thanks for the advice. I'll try the adjustment tonite.
BTW, those still interested in my TKB, if you have a chance, gimme a
ring at (915)-241-7067

cuari