I have a Savage Audio Glas 30 2x12 combo that I run through a 4x12 cabinet loaded with Celestion greenbacks. The Glas 30 is kind of like a Vox AC30 and I had many AC30s they just always broke. So I sought after an amplifier that would kind of give me that classic AC30 kind of sound but would be more reliable and maybe perhaps even better. I found that with the Savage Audio amps.
You need an amp that is made well. At lot of amps today are very mass-market, and a lot of things aren't made as well as they could be, and that reflects in the amount of times they'll break down. That Savage amp is made really well, no corners are really cut while making that amp. We tour a lot, extensively, but I've never had a problem with that amp. I'm fortunate, but I researched and invested in buying a decent amp and I haven't had any problems.