I picked up a Marshall Valvestate 8008 power amp and a Mesa Boogie Formula Preamp second hand recently. Really liking the sound of them together. But it's not that loud in mono.
Running the preamp and poweramp in mono through a Zilla 1x12 Fatbaby with one 16ohm Celestion speaker. I'm just using a single output from the Marshall power amp. It's fine for loud home use but maybe not enough headroom for playing with a drummer.
Do you think it's because I'm running it in mono? @Clarky would love to hear your opinion if poss. Think you've got the same power amp?