The 5868 or AX9902 and TB4/1250 is a 450 watt power triode with a mu of 28 and a maximum frequency of 100 MHz for full output.
Length = 8.00" Diameter = 4.25"
Max voltage = 4000
Max current = 535 ma
Fil voltage = 10
Fil current = 9.9 amps
Data sheet:
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