The input jack is probably grounding or has a bad ground. it probably has a bad solder joint on the jack to the circuit board. if you can open it up gently look at the pins of the jack to the pcb. make sure the battery is disconnected! dont want to short anything out. it may be hard to see, but you can push on the jack and see if the legs/pins move, etc. humming and buzzing sounds usually are a bad ground. especially on a unit this small.
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SOURCE: amp works on off on off
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
Jay.D Bsc Music Technology
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SOURCE: my fender twin has alot of buzzing and hum noise
It is usually caused by interference somewhere in the room. A major source is art CRT such as a TV ot computer monitor. First try turning off any other electic devices in the room. Your could also see if there is a ground lift switch on the amp. If that dosen't do it, you can try lining the cavity of your guitar with tin foil. I t sounds weird but it does cut back on some interference. If none of those work, bring your amp to your local tech and have the preamp tubes tested. It may be that one of them is going bad.
SOURCE: Ground hum from Martin OOCXAE having Fishman preamp...
do you have active or passive pick-ups? if active, pop in a new 9volt battery, that might do it, it worked for me. if that doesnt work, go to guitar center or somewhere and get a heavier insulated, better constructed cord. sonds like you might be completing the ground from interference if its not your battery. hope this helps
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