The F-129B is a water cooled power triode with a mu of 26 made by Federal Telephone & Radio and is rated at 7.5 KW. It operates at full ratings to 30 MHz.
Length = 13.00" Diameter = 5.75"
Max voltage = 12000
Max current = 2 amps
Fil voltage = 18
Fil current = 58 amp
Data sheet:
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