Quote:
Originally Posted by high_vacuum_house
Good afternoon,
I presume the EY51 heater is lit, the valve hasn’t lost its emission or there is a failure in the EY51 heater winding on the LOPT. I would check all these things first as these would cause no DC output from the cathode of the EY51.
Christopher Capener
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I did change the EY51 but cannot see any illumination from its heater. I am tempted to try substituting the EY51 with a solid state device such as a TV11 stick or similar. I am still baffled by the smallness of the sparks at the top caps of the PY and PL valves - or maybe this is normal for these very old sets? Perhaps I am too used to seeing the bigger sparks on later sets e.g. 1960s/70s.