I appreciate you taking the time to go into that in more detail. I am how ever unfamiliar with a couple of the abbreviations you used.

STT = ???

SRH = ???

IGBT =????

While I've got a pretty decent reference library of technical books on welding (and a lot of them have chapters on power sources and electrical characteristics for the different welding processes) the problem is, is that they were all pretty much written 30+ years a go and don't have much useful information concerning all the advances that have been made in power source technology in the last 20 years. Would you happen to have a recommendation for a more up to date text book that would give a guy a better general understanding in to this new inverter base technology?