Wow, how odd. I do know of a few "amp specialists" around LA that came out of guitar amp manufacturing QC departments and only had "on the job training" - but they know to stay within limits. And I'm rusty enough that I'd probably turn it down, although I *could* do it. It'd just take me too long to kick the right synapses into gear! But most of the real pros know are all in their 50's and 60's, and we all learned basics building Heath, Eico and other non-instrument related gear - receivers, "hi-fi" amps and preamps, crossovers, power supplies....oh - and fixing cathode-ray tube TV's! When we were in high school at least a quarter of electronics was *required* as part of "shop" class. I took 4 years, the last as lab assistant (i.e. I taught the class while the teacher took naps after eating an apple that had a faint smell of vodka ). We even rebuilt...and had working...a surplus Navy portable radar unit. Until some guys in suits from the TRW Systems complex next door showed up and demanded it be deactivated - apparently it was fouling their satellite test gear There are also guys like Rob Robinette who had military - and more - electronics training. Amp builder Mike Holland is another ex-military guy. However, I think I know what you're talking about - FAR too many "techs" have appeared with training that started...and ended...with Gerald Weber and Aspen Pittman books and a used (and not understood) copy of the RCA Receiving Tube Manual.