Just do what I did...cut your losses and go with another amp. I couldn't get my LSS to sound like I wanted it to. I also had a matching 410 cab which helped a bit. Anyway, I traded my rig + a few bucks for a '06 Bogner Shiva. Oh yeah.... Guess I'm outta the Mesa club?
I had the same problem with the rectifier tubes popping. Blew a Mesa and a NOS. Sent it to CA..cost about $25 via UPS and they had it back to me in 8 days. No receipt, no charge, no return shipping.
Excellent customer service IMHO.
Greg
Austin, TX