The WE215A is a triode with a mu of 5 to 6.5. This tube is also known as a D-80039 (VT-5) for military use in WW1. Length = 2.37" Diameter = .63" Max voltage = 100 Max current = 2 ma Fil voltage = .85 to 1.1 Fil current = .25 amps GOTO INDEX