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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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