The 357B is a 400 watt triode with a mu of 30 and a maximum frequency of 100 MHz for full output. The first example was made for Western Electric by Machlett and the second is a Machlett ML-357B.
Length = 8.00" Diameter = 5.10"
Max voltage = 2700
Max current = .5 amp
Fil voltage = 10
Fil current = 10 amps GOTO INDEX