The 212E is triode with a mu of 16 designed as an audio tube by Western Electric. Maximum ratings to 1.5 MHz. Length = 12.50" Diameter = 3.25" Max voltage = 2000 Max current = 300 ma Fil voltage = 14 Fil current = 6 amps Data sheet: GOTO INDEX
The 212E is triode with a mu of 16 designed as an audio tube by Western Electric. Maximum ratings to 1.5 MHz.