Archive of the former Yahoo!Groups mailing list: MOTM

I was building a batch of MOTM-110s tonight and had 1 that had the dreaded
noisy pot
problem. Trouble was, this pot had never been on a panel! And, it was a new
style Spectrol
pot that is supposed to be "smoother".

With no signal applied, as the GAIN pot was rotated the noise steadily got
louder.

Well, the culprit was ∗residue flux under the IC socket∗!

I took an old toothbrush, dipped it in hot water, and scrubbed along on the
top of the pc board
on both sides of the socket (my dentist would have been proud!). After it
dried, ∗worked perfect∗. Scratchy
pot syndrome gone!

Just thought you'd like the info.

Paul S.