Marshall mod experts…what have we here?

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marshallmel

marshallmel

Well-known member
Amp is a 2005 Marshall 1987x. I know there’s a master volume going on. Both normal inputs are plugged, both high treble inputs are open. There’s a mini toggle that I can’t hear any difference in from one position to the other.
Overall it sounds phenomenal, just wondering what’s going on and who may have done it and if anyone can tell by the work done who may have done the mods.

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Looks like a post phase master and the switch is for something to do with the NFB (maybe) and under the heat shrink looks to be something other than the stock NFB resistor. Not super familiar with those boards tho
 
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