[BC] treasuretrove of older tubes

[BOYDSIRBOYD at aol.com]

to all,
 
i have found 22 EIMAC 4X500F tubes. they're all in original boxes except  for 
a couple.
most have a date on them from 1948 to the early 50's. what used this type  
tube, and does anyone have a use for them.
as far as information on the boxes, it also has the hour usage on some of  
the boxes. now wether this is correct or not is anybodies guess. and are they of 
 any value?
 
bill



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