The fan is running quite fine. I sprayed it with some dust off, and it now works even better!Hi, I have an early model also (#789) with 2x12 cab #33...
I've had no issues. Obviously, make sure your fan is running.
As far as tubes go, I just got a couple sets from www.thetubestore.com (no affiliation). He suggested I try a set of Svetlana's or his store brand 'preferred series'.
The Svetlana's sounded pretty much like the stock Mesa tubes. The Preferred Series sound totally great. I haven't had a band practice since I put them in, but I'm excited - - they seem to add something the stock tubes lacked... Maybe a bit less nasal and a bit more open sounding? It's hard to describe, but from the first few notes, I could tell I wanted to hear more...
I think the tech retuned it with JJ short plates. I don't dislike the tone, I'm just curious aboutother's experiences.