(21-10-2018, 04:44 PM)davegsm82 Wrote: The cathode is at +15v or so ...
Are you sure you are measuring the voltage on the right pin? The anode voltage is stated as 105V and is fed from ~175V via a 100k resistor, so the anode (and therefore, being a triode, the cathode current) is around 700µA.
Thus the cathode voltage should be no more than 0.15V
Hmmm. 15V ... 0.15V (150mV)... seems a bit of a coincidence - are you certain you didn't misread the meter?
