The 4X500F is a 500 watt tetrode with full ratings to 120 MHz. Developed by Eimac. They are electrically the same as a 4X500A but the base is that of the 4-250A family. This may be an early example as its anode structure resembles the X429 circa 1945.

Length = 5.13" Diameter = 2.72"
Max voltage = 4000
Max current = 350 ma
Fil voltage = 5
Fil current = 13.5 amps         GOTO INDEX