The 4X250M is a 250 watt tetrode designed by Eimac with full ratings to 750 MHz. This example is a very early tube in this series as it is ceramic but still has the 4X designation. Later tubes were designated 4CX but they had the more efficient plate cooling construction.

Length = 2.87" Diameter = 1.64"
Max voltage = 1250 CW 7000 PULSE
Max current = .25 amp CW
Fil voltage = 26.5
Fil current = .57 amps         GOTO INDEX