Marshall AVT50 Pops when Switching Channels - diyAudio
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Old 26th September 2010, 08:01 PM   #1
morta is offline morta  United States
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Default Marshall AVT50 Pops when Switching Channels

Folks, I have a Marshall AVT50 that makes a very LOUD popping noise when I switch between channels. I see a few other occasions of this issue on the net, but haven't seen any solution - probibly didn't look in he right places... Has anyone else experienced this issue and maybe has come accross a fix? Thanks, Al
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Old 28th September 2010, 11:59 PM   #2
morta is offline morta  United States
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Join Date: Aug 2010
Default clarification

Folks, Two points of clarification on this...

1. The noise it makes is actually a dramatic, momentary, increase in volume vs. a "pop", and
2. This occurs both when switching the channel selector on the face of the Amp and also using the Footswitch

Thanks for any pointers you can offer..... Al
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Old 7th October 2010, 04:13 AM   #3
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Join Date: Nov 2004
Location: NCR
Well, the first thing that comes to mind is dirty relay contacts.

however if this amplifier uses JFETs to switch between channels, then it might just be a loose connection or component somewhere in the channel switching circuit. You'll have to take it apart and measure some voltages. And try to write to Marshall for a schematic, you'll need one.

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