Hints and tips on getting the sound you want.
Includes anything to do with Fender, Burns and other guitars; playing techniques;
also amps, effects units, recording equipment and any other musical accessories.
by buckshot » 24 Nov 2012, 11:59
G'day All,
I have an original '67 AC30 TB with no mods whtsoever done to it. Everything is original except for valve replacement. I have been giving it a good workout lately( It has been dormant for a few years) and find that it is getting a hum up when I turn up the bass knob, getting louder as I increase to full .
Any ideas of what may be causing this .??
Cheers
Tom
OZ
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buckshot
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by RayL » 24 Nov 2012, 12:50
Electrolytic capacitor. If the hum increases when the bass control is increased then that points to a capacitor in the preamp cicuitry at an earlier point in the circuit than the bass control.
These capacitors don't last forever. They consist of a semi-liquid electrolyte between foil and paper layers. This electrolyte can dry out over time. If the amp is from 1967 you could give it a new lease of life by having all the electolytics changed (there are not many of them).
Ray
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RayL
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- Posts: 1247
- Joined: 16 Sep 2009, 16:25
- Location: Carshalton, Surrey
by buckshot » 24 Nov 2012, 23:54
thanks a million Ray,
I will send it off to my amp man asap.
Cheers
Tom
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buckshot
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