Echinos wrote in message
ups.com...
I have an old Morse brand FM stereo / phonograph unit (model 74452 for
the extra-curious). The volume crackles horribly when I turn it up and
down. I have the pot half-disassembled and half-disconnected.

I am thinking that I can either clean it, or replace it. This is a 30+
year old stereo, so I would like to replace it, but it is a double-pot.
I've googled and such a bit, but I've not been encouraged with the
results. So, I'm back to cleaning it. I have gone through some past
posts, and it seems that while cleaning is an option, it is not
guaranteed to work for any significant period of time, if at all. I may
try to get some cleaner tomorrow, but I'd like to know what you may
think of the situation.

Details on the pot - It is labelled with the following:

Top Pot - VR-23J M 250Kohm AX2 SF J62X (or J82X, not sure)

Bottom Pot - 3A125VAC 1.5A250VAC

So, as you can see, the pot is double because the top is for volume and
the bottom is for power. It clicks when you turn it all the way CCW.
Also, one of the wires from the wall plug goes straight to one of the
terminals.

Basically, my question boils down to: Is there any hope of replacement,
or am I stuck with seeing if I can clean it?

I can post links to pictures if anyone wants a look.

Cheers.


An improvement on the pencil graphite on worn potentiometer track trick.
For pots that are worn and it is not possible to replace or adjust the
sliders to an unworn part of track. Dismantle to expose the carbon track/s.
Make up a paste of one part silica gel to one part of powdered graphite
(from locksmiths / hardware stores for lock dry lubricant) into a paste and
smear onto the track and reassemble the pot.

More tips on the 2 tips files on my index file below

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/