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Amp works on off on off

I plugged in my amp and turned it on extreme buzz and or hum i plug in my guitar cord and turn the volume up . 3 minutes after playing extreme buzzing/humming next i have to play with the guitar cord at the amp just touch or tap to get it to work again

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The buzzing is possibly the electrical mains hum at 50hz, all amps have a hum/buzzing... if you have to tap the jack lead between the guitar and amp it could simply be a connection problem, the cable may be old and internally damages, maybe loose wiring on the other side of one of the input jacks

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Not sure yet, but before considering a fault with the amp, does it only make this humming noise when not plugged into the guitar? I am thinking that the cable might be faulty.

If it while the cable is plugged in the guitar, does the humming disappear when you turn the volume control(s) down on the guitar? I am thinking that one or pickups may be faulty.

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