Modding a Dunlop Rotovibe to oscillate slower

[jm22]

I have a Dunlop Rotovibe, which I like, but I don't like the sweep on the fast side. I'd like the maximum fast sweep with pedal full forward to be at about half the speed it is now. I'll probably have a pedal guru mod it, but I was still hoping to get some idea of what the mod might look like. Would the pot get switched out for a different value? Or would other components be changed as well?

[PRR]

So double the timing caps. I don't see a schematic/link to guide us?

[antonis]

https://guitar-gear.ru/wp-content/uploads/2016/08/Rotovibe-Dunlop-Rotovibe.gif

Check for 50kC Speed pot with 2k5 Speed trim and 1k R20 resistor around T1 2N5952 FET..

P.S.
Paul, the only time-relevant cap I can figure out is the 22μF C10 one..
(but I'm not sure if it has to do anything with timing..)

edit: U6B and surrounding circuit comprise LFO..
(my bad..)

[jm22]

Thanks for the replies. It's a great pedal, but it's just too fast at the extreme. I'll pass on the info.

[Pi314Vigo]

Hello!

There is a very simple way to make the Rotovibe oscillate more slowly.

First, place the pedal upside down, on a table, and remove the back cover. Put the pedal in the fastest position (just before the click)

You have to remove the piece marked in the photo with the yellow box: it is the stop that holds the pedal stick and the sprocket together.

I marked the position of the sprocket with a white marker in case I want to return to the initial configuration.

Once the stop is removed, you can pull the pedal stick back, and now the sprocket (and knob) is free. Now you can turn the knob to lower the oscillation speed. I lowered just one tooth of the sprocket and thus halved the top speed, but you can lower it even more. I did it with the pedal plugged into the amp so I could hear the oscillation.

Once you choose the maximum speed, you just have to put the stick in place and screw the stop back in place.

[GibsonGM]

Yes, as Vigo said, that may well give you the adjustment you need. It's the same as adjusting a wah...you move the 'rack' and turn the pot back, then put the 'rack' back into the 'pinion' and tighten the screw.