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STUDIO ACOUSTIC 15C

#1 User is offline   Seagull 

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Posted 13 December 2017 - 04:48 AM

It's an Epiphone Studio Acoustic 15C.

Not a big amp, but very light weight with a pretty clean sound.

There is a hum when I'm plugged in that completely goes away if I hold onto either cable end.

Its a new cable but a cheap one, I have another to try tonight.

What do I need to look for inside the amp if it goes that far?

Or is there a common cure for this ailment?
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#2 User is offline   Seagull 

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Posted 13 December 2017 - 09:28 AM

Mods, I am sorry. I put this in the wrong forum.

Please move it if you need to.
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#3 User is offline   kidblast 

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Posted 14 December 2017 - 12:02 PM

How old is the guitar? over time, the down pressure from the bridge squishes the materials used in the layers of the peizo pickup element, once that happens, the ground starts to fail. (this could take any where from 10 to 15 years in most cases)


There's also a chance that there's something in the room causing interference. If you try another sound source (like plug into pa board) a different amp if possible, or even move the amp to another spot in you dwelling, does it continue?
/Ray
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#4 User is offline   Seagull 

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Posted 19 December 2017 - 07:50 AM

Thanks Kidblast for the reply.

The guitar is new, month old.

My Martin does the same on this amp. Neither guitar does it in our Church PA system.

I tried a better cable, both are pretty new. It helped, but had the same issue.

I read a couple of things online, looks like I am not the only one to have this issue.
But I saw no good fixes.

This weekend I am going to take the amp apart and make sure the ground is good.

I also found that I have to have to be holding the guitar when I touch the cord to make the hum stop.
If someone else touches it, the hum remains. So I am completing some kind of circuit.
One of the online fixes recommended clipping a wire between me and the cable.
I'm sure that would work, but there has to be another way.
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#5 User is offline   Leonard McCoy 

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Posted 19 December 2017 - 02:05 PM

It sounds like a grounding issue with either the guitar or the amp. I'd start the investigation there.
2009 Gibson Les Paul Standard Ebony (Left-handed)
2002 Gibson "Goldtone" GA-15RV
1990 Ovation Legend L717 (A-bracing)

Finely transcribed Cat Stevens Guitar Tabs (fan project)

"Believe me when I say that some of the most amazing music in history
was made on equipment that's not as good as what you own right now."óJol Dantzig, founder of Hamer Guitars
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#6 User is offline   kidblast 

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Posted 26 December 2017 - 07:43 AM

View PostSeagull, on 19 December 2017 - 07:50 AM, said:

One of the online fixes recommended clipping a wire between me and the cable.
I'm sure that would work, but there has to be another way.


This will work.

The guy I play with occasionally has the problem too in some venues.

he has a piece of wire about 2 feet long with an alligator clip on one end, and bare wire on the other. Clips the cable onto the input jack, and tucks the other end inside his waste so the wire makes contact with his skin. Silences the hum instantly.
/Ray
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