Dunlop Univibe UV-1 issues

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hemisfeer
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Joined: 18 Oct 2015, 14:55
my favorite amplifier: Fender Hot Rod Deville 410
Completed builds: A lot of the BYOC catalog as well as some ModKitsDiy pedals. Looking to venture in to amps someday. Need to learn some more
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Post by hemisfeer »

Hello everyone. I have a Dunlop UV-1 univibe. Its the version with one main PCB. Not sure what Rev it is off hand. The issues I'm having are, noise in the signal path and an unresponsive speed control. I get static of sorts when it's in bypass and active. I also plug in the UV-1FC foot controller and the it bypasses the speed knob but it is still unresponsive. I'm guessing it could be the the optocoupler before the intensity control. But I can't find any replacement for the NSL-39S52. Volume and Intensity all work as they should. I also replaced the speed pot with a C10K as was the original.
Any insight would much appreciated.
Dunlop - Univibe UV-1 - Schematic (2-3).pdf
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User avatar
hemisfeer
Information
Posts: 37
Joined: 18 Oct 2015, 14:55
my favorite amplifier: Fender Hot Rod Deville 410
Completed builds: A lot of the BYOC catalog as well as some ModKitsDiy pedals. Looking to venture in to amps someday. Need to learn some more
Has thanked: 10 times
Been thanked: 19 times

Post by hemisfeer »

An update, the Xvive Vactrol from small bear electronics is a good replacement for the vactrol in these. Might have to adjust the internal trim pots to get the speed in the proper range.

https://smallbear-electronics.mybigcomm ... -vtl5c3-2/
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