These older heads here have some serious versatility, just like a T-40. I can't remember exactly how you could run series/parallel/both/etc. with the channels, but I know the manual isn't too hard to find online. I had one for a sec and it could sound all kinds of brutal if you wanted. They are still super cheap on the used market.
![]()
Was thinking about getting one of these a few weeks ago but wasn't sure if they'd be loud enough.
They do look super rad.