Thank you for your contribution to this 18 year old thread.
😂
@sholtz 's tube rolling advice was solid, though. Big Rogue amps sound clean, neutral, and dynamic. Definitely not warm sweet and lush like a "classic" tube amp. But they are indeed a good platform for using tube rolling to nudge the sonic flavor a bit towards a desired direction. Mullards will always nudge it towards the warm & lush side.
Sometimes they've shipped their amps with tube complements that would be considered on the "bright" side of things - for example in 2010 I got a new pair of Apollos with EH KT90 and EH Gold 12AX7 and Gold 12AU7. Definitely wouldn't have been my choice, but this was easily pulled back to neutral with some tube rolls.