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Old 17th October 2010, 09:34 AM   #11
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The particular circumstances are a slightly gassy tube.

Ion bombardment


It seems, I think, the issue is not ion bombardment of the cathode, because ion creation calls for accelerated electrons which calls for positive voltages on the plate or some other electrode.

Interface resistance

I think this would be the issue of concern. But perhaps not if the tube is run for several hours or a day or two.

I'm not sure how interface resistance occurs, I think it's some interaction between the cathode and impurities in the tube.
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Old 17th October 2010, 03:23 PM   #12
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Well, the thing is, that from what I can tell, my enquiry is fairly certainly answered.

And that is that running the filament only, will produce no harm to my slightly gassy KT88 - if the length of time is several hours or even a handful of days.
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