09-15-2015, 09:38 PM
Of course a short in a multi grid tube could also show good for emission or conductance, or whatever, and some tubes were just so screwed up in pin designation that footnotes, sometimes just as screwed up, were needed in tester documentation, which as we all know was not always all that well documented.
As always, a "known good" substitute is he best bet.
As always, a "known good" substitute is he best bet.