Intensity pot w/ switch

[Bob M.]

Does anyone know who makes/sells a 50K reverse audio pot with a rotary switch suitable for switching on an optoisolator tremolo in a Fender (type) amp? I've found I need that little bit of extra gain.

Thanks,

Bob M.

[tedmich]

reverse log is pretty rare, although a 100k linear pot with a parallel 100k resistor will give an approximation of a reverse log taper 50k pot (graph it to see!)

here is a linear 50k w/ switch
50K Potentiometer with Switch SPST ON OFF: In Stock Buy Now | West Florida Components

[pdf64]

Just replace the 50k rev audio pot with a 100k lin. That keeps the trem available all the time from the footswitch.
When I used a switched 50k RA pot (from weber), I found that the 50k intensity pot makes the tone go weedy that I never wanted to switch it back in.
I did some tests comparing the gain with a 50k load, 100k load, and the 440k load (of the 2 x 220k mixer resistors).
I think that with reference to the stock 50k load, 100k gave a 2dB gain increase, 440k gave a 3dB increase.

[tedmich]

Just replace the 50k rev audio pot with a 100k lin.

if so:
100K Ohm Potentiometer with NO NC Switch

[Bob M.]

Thanks, guys, for the info and insight on how to get around the problem. I'll put it to good use.

Bob M.

[tubeswell]

Yep the 100k resistor needs to go between the 100k pot input and the pot wiper for antilog taper.

[Bob M.]

100k Pot and resistor seem to be working just fine!

Thanks!

[Groover]

Weber part # wp503RAS

I have one I got from Weber. It is their part # wp503RAS.