Guitar Amplifier Hum Varies with Volume Knob - Page 4 - diyAudio
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Old 14th September 2013, 08:26 AM   #31
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Quote:
Originally Posted by tinitus View Post
if using 'onboard' active pickup pre, I suppose you should have DC protect cap on input of your pre/power/combo amp
All amplifiers should have coupling capacitors on their input, just as all preamps should have the same on their output.
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Old 14th September 2013, 02:17 PM   #32
tinitus is offline tinitus  Europe
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yes ... but does this amp have any ?

is your guitar bridge properly grounded ?

do you have the same problem if connecting other instrument/guitar to your amp ?

or did you try your guitar on other amps ?
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Old 14th September 2013, 05:58 PM   #33
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This problem is very common when guitars with non-humbucking pickups, like P-90 eared soapbars, are plugged into a high-gain preamp with a lot of compression. Unless the input is shorted the compression and gain try to make the noise as loud as the signal.
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