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PJL · 12th Jul 2018, 1:17 pm

The runaway ones might be air?

The electrons from the cathode collide with the air molecules knocking off electrons and creating ions that migrate to the grid. If there is sufficient gettering left to absorb the air they might recover if run hot for a while (not red!).

12th Jul 2018, 1:17 pm	#2
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Testing 807's. The runaway ones might be air? The electrons from the cathode collide with the air molecules knocking off electrons and creating ions that migrate to the grid. If there is sufficient gettering left to absorb the air they might recover if run hot for a while (not red!).