The 50 was a 25 watt triode with a mu of 3.8. Early versions were called the UX-250 and CX-350. It was designed primarily to be an audio tube and low power RF tube.
Length = 5.75" Diameter = 2.50"
Max voltage = 550
Max current = 60 ma
Fil voltage = 7.5
Fil current = 1.25 amps GOTO INDEX