[sdiy] Vestax multipole potentiometers

mark verbos mverbos at earthlink.net
Sat Nov 1 20:05:19 CET 2008

Those pots are specially designed to allow a different gain and  
reduction on either side of unity. They only allow +4dB of gain per  
band, but infinite reduction. The channels are stereo. The schematic  
show pins 1,2,3 are on the left side 4,5,6 are on the right side and  
7 is ground. The ground is a center tap to make the detent in the  
middle actually zero. With an asymmetrical control like that, I think  
a center tap is the only way it would match up.


On Oct 31, 2008, at 4:07 PM, Johannes Öberg wrote:

> I'm trying to mod the 3-band EQs on a Vestax PCV-180 DJ mixer, and it
> contains these potentiometers with 7 leads on. (they're not mounting
> bracket legs, has those too.) They're blue plastic pots with black
> plastic D shafts, only markings are "203C 311C".
> I found the schematics for a possibly similar mixer, the PCV-02, which
> looks like it has the same EQ as the PCV-180.
> (http://www.eserviceinfo.com/downloadsm/5709/Vestax_PCV-002.html, page
> 8 in the pdf)
> In the PCV-02 each EQ pot is a stereo 20k, however there's only 6  
> legs on them.
> What does my 7th lead to? How can I find out what each leg on the  
> pots does?
> I hope I can avoid desoldering the pots; don't have the equipment to
> do that reliably.
> I just want to add switches to temporarily short them to their most
> CCW position (i.e. frequency kill switch).
> /J
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