On Sun, 05 Nov 2017 22:00:52 -0800, David Farber wrote:

This Rickenbacker RM112P monitor amp came to me with the complaint that
it randomly crackles and pops. I plugged it in this afternoon and of
course it didn't make any pops or crackles. I disassembled it and
cleaned the controls. They were only slightly noisy. I was unable to
locate a schematic for it. If it does decide to break down and make the
noises, I would like to be able trace the signal. Does anyone have a
link for a schematic? It's very clean inside. There are a few potential
problem places that I see. One is that there is double sided sticky tape
holding the filter capacitors in place. The p.c. trace is not insulated
and I was wondering if that could be causing a problem. Secondly, there
seems to be some type of chemical reaction happening leaving a flakey
orange substance where some of the components are connected to the
circuit board.

http://webpages.charter.net/mrfixite...-terminals.jpg

http://webpages.charter.net/mrfixite...ilter-caps.jpg

Thanks for your reply.

Looks like the filter cap lead in the middle of the pic may not be
soldered properly!