all i know is,
my (now vintage) Mesa Boogie Mark 2b, has been amazing.
purchased in 1981, it spent the next 4.5 years on the road full time, being tossed into trucks and back out weekly, in an ANVIL case, of course, and never broke a single tube.
it fell, from a height of about 5', face first onto a carpeted drum riser, broke off one of my EQ sliders, but worked perfectly for the next 24 years without EVER seeing the inside of a repair shop.
i re-capped the entire head back in 2010, seeing as to how it had been 29 years old, and the caps were only a little bit out of spec.
i replaced the broken fader at that time as well, and this is still my main amp.
60 watts, with graphic EQ, 6L6's, big big iron, that is a sweet spot of an amp for me.
there are wiring specs on the web, of course Randall Smith was one of the first to tout the use of PCB's in addition to fine hand wiring, and i can attest as to the lasting power of that design.
Boogies rock.