Got a chance to use this thing finally. According to the Math it should come out at 39ma but all I can get is 33 on one set and 31 on the other set of EL34's in my JCM 800 2203. I think Doug R had mentioned before about not going over 35ma ever with an EL34 but how do you explain that with the Math? The most I can get with the Bias Pot Full up is 33.4 This is all new to me so I'm trying to be cautious. Anyone have any thoughts on this subject. Now bear in mind I'm using Bias Probes not a Scope.