Stepped Attenuator to replace Potentiometer.

Set the pot so as to give the gain that you require.
Then, measure the pot seting. Slider contact to high, and to low.
Then install a two resistor divider.
You can leave the pot in place, disconnected, in case you need to reverse the mod.

What pot? How old is this Wolcott? I've been involved with this company for many years and there is no gain control I'm aware of.

Are you referring to the feedback control? If yes, that does not serve the same function.

Hello Mr. Porter:

It is good hearing from you. I spoke with you some time ago from up here in New Hampshire. We are using the original CA-250 monos from 1972 -- pretty much renovated throughout -- that was listed as MR-250 (for Marine Research). As for the controls on the front of the monos, they are gain controls. We have a Threshold Stasis R5 controlling the main volume. I was just wondering if it be worth an upgrade on the MR-250s to upgrade the gain controls to something like DACT attenuators, known for their precise management of signal levels; however, given the 25 meg ohm impedance on the gain control pots, I am at a loss as to how to get around this without having a tech do some surgery on the innards. Any ideas? Thanks and hope all's well in TX.

Now I understand, that's why I ask how old. I knew anything in the last 20 years had no volume pot.

Good call on the impedance issue, that's mandatory to maintain. I'm not qualified to tell you what to change to make it right. Have you tried to contact Wolcott audio for advice? Hank is very bright.

Try Shallco.. http://www.shallco.com/attenuators.html