On Mon, 16 Mar 98 07:29:35 -0800 Rich Measures <email@example.com> writes:
from melted grid wires, however, I have seen many that failed from
>grid to filament shorts due to a bent filament helix which manifested
>itself immediately after an arc and "big bang". Last week, I tested
>Eimac 3-500Z that was virtually brand new. It had recently been
>installed in an out of the box, new TL-922. Within several minutes,
>there was a "big bang", and reverse grid current plus anode current
>indicated on standby. . . When I tested the tube I discovered a
>grid-filament short. . . It is my opinion that the tube shorted due
>an intermittent oscillation at c. 120MHz.
I am glad you stress that it is only an opinion Rich.
BTW, what was the date code on that tube and did it come from the NY/NJ
Tnx Carl KM1H
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