[Argus25]

.....just getting the data sheet out of my files on the transformer, the peak voltage on the plate will be roughly about 1350/4310 of the EHT + the boost voltage, So if the EHT is about 8kV, the plate voltage peak will be 2.5kV plus some. So probably its in the region of 2 to 3kV at a guess, when all is normal. As I say, I'm not sure what the exact EHT is supposed to be on a TV22, so it could be higher.

So it pays to keep test instruments & probes away from that anode cap. I have a 1000:1 50kV high frequency capable probe. Next time I have the TV22 on the bench I will document the anode waveform and EHT value.

One way to measure it though is with a capacitive divider, a 10pF and a 100pF high voltage capacitors works to divide it down by about 10, but the DC component of the boost is lost and if doing that make sure the earthy end of the 100pF doesn't fall off!