Author Topic: when did ge change to an external stamp on the f8t5 tubes?and first make a /bl?  (Read 2057 times)
toomanybulbs
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when did ge change to an external stamp on the f8t5 tubes?and first make a /bl? « on: January 16, 2012, 09:56:56 AM » Author: toomanybulbs
found some rather old f8t5/bl tubes in a box of vacuum tubes with worn print.
i remember old ge tubes with inside printing.when did they change?
and when were /bl tubes introduced?
one in this lot is a /blb that has identical construction but stamped sylvania.
have nib sylvanias that also look like the ge.same cap supplier or one made the tubes for several brands?
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