Sounds very HM-2 to me, the tone is to fizzy and dark to be a 800+TS, maybe they were using neck pickups for rhythm.
Nope, stock MIJ vintage Iceman 1C-50, bridge pup with tone turned off.
This has been stated on numerous occasions, the use of JCM800s, by Tom Warrior himself, and can be easily documented by just looking at some older Hellhammer rehearsal pics. This is also the same rig he's using today with Triptykon.