I found this article about a 958 acorn tube:
" In 1942 the 958 received tighter controls on emission and became the 958A.
This was in response to a report from the Navy that, in one of their
transmitters -- possibly an early model of the TBY -- the tube kept
oscillating even after filament power was turned off. Filaments with
unusually high emission could keep going, heated only by the plate current."
The 958 tube is similar to the lovable old 955, although it is a transmitter
version (more filament power). But, the comment raises an interesting
point. This is sort of like a vacuum tube that "diesels" afyou remove
filament power. With tube plates thare are red or white hot, did any of the
tubes ever take advantage of this characteristic?
73, Colin K7FM
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