[Amps] switching power supply for tube amplifier

[Steve Thompson]

> Another is power supply design, you can not always blame the piece of Si,
> add poor cooling, crappy assembly, under rated caps, no over load/short
> protection (deleted by the bean counters) etc. etc.
It's important to take all the factors into consideration. There's 
some brands/designs of tube amps that have a poor reputation here, 
primarily because of design failings.

In 31 years of solid state amp design I've killed surprisingly few 
devices outside of experimental/development times. In 1990 I 
branched out on my own and the first job was a couple of dozen 
amps running 150W for an underground comms system. Earlier this 
year we had the first field failure, at just under 3.5m 
accumulated operating hours. A chip capacitor exploded. The 
transistors were fine.

Steve