The HF-201A is a 150 watt triode with a mu of 18 and a maximum frequency of 30 MHz. Made by Amperex. Length = 10.87" Diameter = 2.75" Max voltage = 2500 Max current = 200 ma Fil voltage = 10 - 11 Fil current = 4 amps Data sheet: GOTO INDEX
The HF-201A is a 150 watt triode with a mu of 18 and a maximum frequency of 30 MHz. Made by Amperex.