The D50 is a water cooled triode made by Federal. This tube appears to be a 150 KW F-134 with coaxial filament connections. The data given is for the F-134.
Length = 34.50" Diameter = 9.00"
Max voltage = 20,000
Max current = 24 amps
Fil voltage = 25
Fil current = 650 amps GOTO INDEX