On Feb 28, 4:41 am, "Arfa Daily" wrote:
I'm sure that I'm probably opening myself up to a bunch of abuse here, but I
have to say that in over 35 years of repairing group amps, the number of
occasions that I've found the effects send and return socket switches
causing a problem of intermittent output, has been so small that I would
consider it negligible as a problem

I see it all the time. You have to remember that lots of this stuff
spends it life in smoky bars. The "bar ick" gets into the n.c. jack
contacts and can cause intermittent connection. As long as the jack is
in good mechanical condition, they can be cleaned and put back into
service. I just cut card stock into thin strips, coat it with good
contact cleaner and drag it through the contacts till all the ick is
gone. Then treat with contact preserver. Works great.

For oxidised jacks I'll pull them out and toss 'em in tarn-x followed
by contact preserver.