What brand of tube would be the best for hot-rodding a marshall head.
Framus Cobra
Marshall JCM 900
peavey 5150

Mesa 4x12
^ yeah and if you wanna go extreme you can get a Soldano Hot Mod to add a whole extra gain stage.

TAD E83CC 7025 Hi-grade on my LAney VH100R is very high gain as well.
Gibson SG '61 RI
Fender MIJ 62RI Tele
PRS Singlecut SE
Epiphone Sheraton II
Ibanez AEG10NT
Orange Rocker 30
Blackstar HT5C