Bob Backert, of Backert Labs, RHB Sound Dezign. He's in PA been doing repairs and mods forever. Raves from customers on his preamp & amp mods led to Backert Labs own preamps. Bob is one high integrity guy! He's done wonders for many of our local audio club, and has been mentioned on some previous threads here.
http://www.rhbsound.com/
Cheers,
Spencer
http://www.rhbsound.com/
Cheers,
Spencer