Thread: VCM163 Anomaly
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Old 17th Jan 2021, 5:42 pm   #5
cathoderay57
Nonode
 
Join Date: Oct 2017
Location: Bristol, UK.
Posts: 2,368
Default Re: VCM163 Anomaly

Hi Martin, thanks for your response. I did your test with a pair of EF91s. When I removed the hot valve and immediately put in the cold valve there was no continuity indication. Quickly putting the warm (by then tepid) valve back in showed continuity briefly again but decayed until the valve had fully cooled. I don't think my entire stock of valves all have thermally dependent heater-cathode shorts, so unless I've gone stir crazy in the lockdown (always a possibility) it looks like the continuity is definitely happening within the valve. Cheers, Jerry
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