I often come across corroded or dirty contacts so the amp stops functioning.
If the spriginess of the metal has failed then replace obviously, but what
about the more usual case where it is only corrosion/airborn contaminaion,
not really necessitating pulling the amp apart to replace them. Any ideas
how to deal with.
1/ solvent clean the contact/s
2/ abraid the contacts with file
3/ coat the contacts with something
3/ add compressible material , glued in place, over the spring section to
add closure force
4/ if the sockets are never used for effects etc , bridge tightly across the
contact with fine copper wire, soldered in place, "shorting" the switch - if
plugged into at some future point then the wire will break
5/ any other ideas to reduce the possibility of re-occurance

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