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Amp buzz


pantherairsoft
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Hi folks,

Yesterday my amp ran silent. It went out to the studio with me yesterday and back last night.

Having plugged it in this morning where it usually sits at home, same power socket, same cab, cables everything it has a low level electrical mains hum style noise through the speakers.

The odd thing about this, is that the hum gets quieter the higher you turn up the amp volume, being loudest when the amp volume is at zero or the amp is on standby, then completely vanishing if the volume is turned to max.

Ive tried different speaker leads, power sockets, a different cab… etc etc etc

Any ideas?

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Try it in a different part of the house to try and eliminate local interference first.

Haha I just noticed you're a mod now Shep. It seems like only yesterday you were a fresh faced young man buying up all the cheap pedals etc. Now look at you. :)

Edited by Ou7shined
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[quote name='pantherairsoft' post='1087604' date='Jan 13 2011, 09:15 AM']Hi folks,

Yesterday my amp ran silent. It went out to the studio with me yesterday and back last night.

Having plugged it in this morning where it usually sits at home, same power socket, same cab, cables everything it has a low level electrical mains hum style noise through the speakers.

The odd thing about this, is that the hum gets quieter the higher you turn up the amp volume, being loudest when the amp volume is at zero or the amp is on standby, then completely vanishing if the volume is turned to max.

Ive tried different speaker leads, power sockets, a different cab… etc etc etc

Any ideas?[/quote]

Sounds like an amp defect somewhere around the volume control.
If you're adventurous you could pop the lid off and take a peek to see if you can see a dry or broken joint.
If not it sounds like a visit to an amp tech (or the retailer if still covered by warranty).

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[quote name='pantherairsoft' post='1087656' date='Jan 13 2011, 10:11 AM']After 5 mins of running the amp i have noticed 2 things… 1. the buzz is still there but has grown quieter. 2. The fan seems far far louder than normal.[/quote]
Assuming your not just noticing the fan more because you have become very aware about the amp, it leaves a couple of possibilities : it is running faster because a smart bit of you amp is telling it to because something is getting hotter than before (I don't know what smart safety features your amp has) or a fault has occurred which has caused more power than normal to be routed to the fan. Both those scenarios require a qualified tech to have a butchers.
Have a peek inside (as icastle suggested) to check all looks ok (as well as solder joints, look out for signs of overheating around components) and if necessary give it a hoover out to clear any dust and crap out that's been sucked in which could in theory cause shorts.

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