my tectronix 545B scope...it's really scary how many "red plates" or something are in there...when it fries I'll need a respirator for weeks :) But everytime that dinosaur blinks to life, I utter a silent praise to the tech who built it. Just wish it did not weigh 100(?) pounds, I need a cute portable like Wayne has. Fess up Wayne, how many mV of hum did you measure coming out of the tube amps!!! Sam