Myles, I checked my bias currents on my 1996 Fender Prosonic. I measured 60ma in class A, 34 ma. in class AB, and 30 ma with the soldid state rectifier. The amp is supposed to be 30 watts class A, 50 Watts class A/B and 60 watts with the SS rectifier. Any idea why the bias current would drop with the SS rectifer? I sounds best in A/B. It breakes up too early in Class A. Your response is always appreciated. Joe