[quote name='bassaussie' post='156461' date='Mar 13 2008, 07:38 AM']The general understanding of Walter's work is that it's a step or two beyond the skills of most repair guys. Supposedly he's got a lot of stuff in there that most guys simply can't get their heads around.[/quote]
That has to be just marketing hype / people justifying expensive amps to themselves "it sounds better because WW is so faaaar oooout maaaaang". There's only so complicated a circuit can get, and even if he is scratching values off components there's still tried and tested, fast and simple ways to diagnose them - which all amp techs worth their salt know.