[Milsurplus] tube spares go to...?

[gl4d21a at juno.com]

270054257111
  Anyone know what set these spares go to?Interesting in that the 
tubes 
are secured in sockets on an oddly shaped chassis.
 Jay



I think the chassis was shaped to fit a cube metal box.  What I want 
to know are 2 things:  Who marks an electrolytic capacitor EF 50, and 
where is the 6H6?

73,
George
W5VPQ


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