The X531 is an experimental water cooled version of the 4X150A from about 1953. The first versions of the 4W300B were glass insulated (about 1954-55). The early ceramic version of the 4W300B (1958) had a larger water capacity and different tubing. Values given are for the 4X150A.
Length = 3.69" Diameter = 1.55"
Max voltage = 1250
Max current = 250 ma
Fil voltage = 6
Fil current = 2.6 amps GOTO INDEX