19" Porthole Zenith

[everstan]

John,

That is very kind of you to provide the pics. The photo of the 1B3 assembly is turned so I can't see the little slit in the metal cup under the socket but I don't see any other wire coming out of there so it must be soldered to the cup as I have had. So that doesn't seem to be the problem for my lack of HV.

You can see on the schmatics the 525 volts I am looking for. Your flyback looks like it has been getting hot. I wonder if the RTF sensor safe silicone coating would help that? Also somebody mentioned to make sure the connect to the 1B3 was clean.

I am now reading in Mandel's from 1952 that the flyback power supply depends on the presense of pulses and that these will not appear should the horizontal oscillator (or subsequent stage) fail. So perhaps not getting any more than a 30 or so volt drop from the 340 volt power supply to the horizontal outputs and off the primary may be causing this?? Could that cause no flyback boost?

I don't see anything wrong with that tube or wiring except the socket is really loose but I don't think it matters if the socket itself does not have a good ground?

I feel like incompentent detective...maybe I will change my name to Inspector Couseau.