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Gibson GA-15-rv / Trace Elliot velocette problems


Flok

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Hi everybody,

i´m new in this forum and i have a problem with my Gibson GA-15 from 1996 i bought last week second hand.

Sounds nice, but it has two problems:

1) The sound control is dead. Nothing happens when you turn the conrol, just in the last inch anti clockwise the sound drops to the dominant midrange which is described in the manual.

2) The amp has a noisy humming, much louder than my blues jr. Without and with the guitar plugged in. Sounds like 50hz, but as i said it is much louder than any other amp i know.

Anybody here who had the same problems or an idea what the cause may be?

I think there must be some parts wich are too old or where the soldering is bad. But if anybody can give me tip where it is worth looking at i would be very happy.

Heres the original schematic and description of every part used in the amp:

schematic gibson amp

 

Thanks for your help.

And if there is any misspelling, please excuse me, i´m german ; )

All the best Flok

post-77218-046851900 1456503007_thumb.jpg

post-77218-022430900 1456503014_thumb.jpg

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