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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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Re: 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

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How do I eliminate buzz?

Things to check:
1. With your multi meter, measure from left ground to right ground. What do you get? Measure from each input ground to chassis. What do you get there.

2. Get or make a pair of shorting plugs. Plug those into the inputs. Power on. Hum there or gone?

3. Turn the pre-amp on. Connect. Level of hum change with preamp on?

4 additional information. How efficient are your speakers? This is a big amp, high-efficiency speakers may show some noise, while low-efficiency speakers won't.

A trip back to the shop may be indicated, too.

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Guitar amp continuous humming from speaker

Firstly, do not disconnect the speakers from the amp when it is on. Damage is possible.

You have a bad ground somewhere in the hookup. The first suspect would be your guitar-to-amp cord shielding connections at each plug, then, the wiring in your guitar. Try changing each of these to another as a trial, one at a time.

Here is Marshall's spiel on hum

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change the plugs on the chords.or both.they loose their resistance.good luck.

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My Garnet Pro 200 tube guitar amp has low volume

You must first isolate the stage that is causing your problem. Start at the master volume control by injecting a signal using a screwdriver. If you get a good level of hum from the speaker then output and phase splitter stages are ok. Work your way back to the front end by touching the screwdriver to inject hum into the input grid of each valve in turn to isolate weak stage. Check anode and cathode voltages on valve of suspect stage. Check cathode bypass capacitor and anode/grid coupling capacitor for open circuit. If fault in output stage check screen grid resistors for open circuit. WARNING high voltages exist in valve amps, keep one hand in your pocket and do not hold on to the chassis while testing.

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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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Carver CT-28v Tuner preamp - Has a hum/buzz (soundls like a ground loop) that is heard as soon as the unit is turned on. Does not increase with volume, just stays the same and is continuous. Changing...

Reverse the polarity of the AC plug and try it. Is there a headphone jack on the preamp? Try headphones with the preamp standalone without the amp attached.

Are you sure the preamp is the problem? I assume you also have an amp or you wouldn't hear anything. Power up the amp with nothing but speakers attached. Hum??? It's in the amp. No Hum? Attach just the preamp with no external components. Hum now? It's the CT-28. Turn it off an exercise every switch and knob throughout its range numerous times. Try again. Still humming? Manipulate source selections, Tape Monitor, everything.

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1 Answer

When plug in guitar to amp, there is either no

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1 Answer

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.

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Crate RFX65 solid state guitar amp has power but no sound


Sounds like the amp has developed a problem. If you had it LOUD then you may have popped a speaker or an output stage. You say it still makes the plugging in noise, what happens when you touch the end of the jack lead whilst plugged into the amp. do you get a burst of clean hum?


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