Marshall JMP 79' Master Lead

[dave6]

i'll try this again.


i'm looking for the traditional marshall "drive" with quite a bit more gain and a thicker tone (more bottom). can i do this with a 79' JMP, or will i have to start with a jcm 800?

all input is appreciated,


dave

[JDW3]

Is it because the stock '79 Marshall M. volume is pre phase inverter? Isn't there the basic mod that puts it after the PI? I was chasing that for awhile a few years ago as I have the same amp. May try that soon, as I got frustrated with mine! A buddy bought one and it smoked mine, his was stock w/6550s. Mine is dark til it gets cranked.

[Denyle_Guitars]

Aren't the MV JMP & the 800 pretty much the same amp?

I'd start by removing the ceramic cap from the pre vol pot if you haven't already. If my memory is correct, I think I moved that cap to the input jack to kill the radio noise.

I also run mine with RCA 12ax7's. They have less gain but it smoothes out the sound quite a bit. The EH 12ax7 aren't too bad in that amp either, if you prefer new tubes.