Sounds like a Marshall!
Probably the IRs. I think it's missing a bit of that Orange kerrrrang that sets them apart from Marshalls -- that less-compressed kind of crunch sound. That's how I associate the RV50 sound in my head in any case. Have you tried Clark Kent's Orange cab IR with it?
Too "congested/saturated" for my taste, TBH.
Especially apparent at 0:22 and later.