[Milsurplus] First Military CRT ??

[Ben Nock]

Message text written by aGEnuine ham
>our 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.<
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

I guess my definition of a military CRT would be a CRT that is used by
the military, and as these two have military stock numbers I'm guessing
they are just that. =


Having a number 10E/1 would seem to indicate a very early tube ?  and som=
e
of =

the gear here has numbers like 10E/67908, and again, only guessing but I
think they may have
been issued near consecutively. =


Still, no one has come up with an idea where it was used yet, we'll keep
waiting. =


As for side contacts, where there not some very early valves that had the=
ir
electrodes =

out the side ?  I would have thought that it was immaterial where the wir=
e
exited the glass =

envelope, surley the problems would be the same for top or bottom, or sid=
e,
entry.
Indeed, a side contact would give closed contact to the electrodes,
certainly in a crt with =

a neck 2ft long.  =


cheers, Ben.