Is Empire Video still in business? Several websites have their rebuilt tubes - maybe they'll still rebuild a 21" round tube - they did in the late 80s.
HBF Electronics (No affiliation, just came up on a search) carries Empire tubes - mostly 19/23/25/25V stuff.
Possible resource...
Cheers,
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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