calling all marshall mod guru's....please help...

[germanaircooled]

Modding my 78' 2204

Hello - I'm looking to produce a a combined saturated marshall brown sound + newer type saturation with a tight bottom...not askin' for much right? I have the cascaded model that has had an effects loop added with some kind of "goop" to cover component values. This amp has a huge amount of headroom, that I'd like to change? It is very load. I've heard that some of these older jmps have very high voltages. I think this is one of them, and I know that makes it hard to get any output tube clip?....

Here's a bunch of pics. I'm running it with just 2 el34's, w/cab imp at 1/2.

Please help...I could use some schematics, and or values, etc.

also, am I correct in that the advantage of a ppimv is the added gain made available from the pi is not offset by a lower signal feeding it?

Thanks to all..