Radio shack cleaner is mineral oil. Ever pay $7 for an ounce of mineral oil? Now you have! Whats the voltage rating of mineral oil?
-Michael Friedlander (IOW, don’t use mineral oil! -ed) • My amp hums – help! (all together now) Do you recognize the tune? If it’s an older tube amp, or just one that hasn’t been played in quite a while, it may need the power supply capacitors replaced. Beyond that, here’s a good, solid post on debugging amp hum; it was in response to smoeone in a country using 50HZ power; you may need to think 60 instead of 50 and 120 instead of 100, depending on where you are. Plug the amp in, turn it on, set all the controls on your amp and your guitar to normal playing position. Hum, right? OK, reach over to the amp and yank the guitar cable out of the input jack. Does the hum go away? If it does, it’s your guitar, or your guitar’s proximity to the amplifier, which throws a 50 Hz field out to a distance of several feet; if your pickups are located within this field, they will couple the 50 Hz signal into the amplifier’s input.
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