The WE220B is a water-cooled triode with a mu of 40 and a maximum frequency of 3 MHz. Western Electric started production in 1923 for use in their 5C transmitter.
Length = 21.00" Diameter = 3.37"
Max voltage = 12000
Max current = 1.5 amps
Fil voltage = 21.5
Fil current = 41 amps
Data sheet:
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