After fixing the pro junior in the "stumped" thread, I was biasing it up and decided to use the transformer shunt method. This method is new to me. For one of the power tubes it worked smoothly... got the tube biased up to a nice coool 23 ma. When connecting my lead to pin 7 (plate) of the other EL84, however, I get this oscillation... a squealing tone that happens as soon as my probe touches pin 7 and is present whether or not the other probe is even connected to anything. I even tried connecting the other probe to the OT center tap before touching it to pin 7, same thing, as soon as my probe comes into contact with pin 7 it's squeal city. What the hell? Anyone care to field this one??