CEM 3340 VCO Question

[Grant Richter]

> 
> I'm having a problem with one of my 3340 based VCOs.  The Coarse tune pot
> barely affects its frequency for almost the first half turn, then goes
> through the entire audio range in the next quarter turn.  I've tried
> adjusting the V/oct trim and the hi frequency trim with no positive
> results.  I have two other VCOs of the same design (Tom Henry's Deluxe
VCO)
> and they don't have this problem.  Do any of you have any pointers as to
> what the problem might be?

Sounds like an exponential curve pot. You may have a mis-labeled or
defective pot?