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I have a Nomad 100. I've done the stock mods (serial loop, remove the mud caps, etc). This amp has never had the punch or low end solidity of my other Mesa, Marshall or PV heads. Anybody see anything on this schematic that jumps out as odd or possible culprits? The amp is actually very similar...

Nomad 100 head: the EQ will cut frequencies fine, but there is no boost when you push a slider past the center line. When the EQ switch is engaged, there is a volume drop until the faders are pushed all the way up, then you're back to unity gain. Anyone else ever have this problem? Q1, Q2, Q3...

I clipped the 5000pf cap to kill the low pass filter after the loop. Loved it - huge improvement. Looking at the schematic I noticed that the presence controls on ch 2 and 3 are not traditional presence controls, but rather variable low pass filters on the treble wiper after the tone stack...