The 3B24 is a half wave rectifier with a center tapped filament. The 3B24W is similar but the plate area is smaller. An entirely different construction was used for the 3B24WB.
Length = 6.88" Diameter = 2.56"
Max voltage = 20000
Max current = 60 ma
Fil voltage = 5 or 2.5
Fil current = 3 amps GOTO INDEX