[Milsurplus] First Military CRT ??

[aGEnuine ham]

Ben:

Your question raises some interesting points.  How would you define a
"Military CRT"?  The reason I bring up the question is that I recall
seeing one inch CRTs in pre-WW2 military transmitters for modulation
monitors (maybe 913 was the type #?)and in other equipment from back in
the 30s, long before RADAR and other 'exotic' applications existed.  The
"A" scope and PPI display certainly kicked CRT development into high
gear, followed by high precision oscilloscope tubes, but phosphor coated
indicator tubes go way, way back.  Someone else may remember details
better, but also, I think all the early tubes had all the connections out
through the base, as glass to metal seal technology was also in its
infancy, and side connections came later when extremely high voltages or
high bandwidth was involved.

73,
George

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