The 4-400B or 7527 is a 400 watt dissipation tetrode. The usable frequency for maximum ratings is 110 MHz. This is the same tube as the 4-400A without the metal base skirt. Amperex produced the 7527A.
Length = 6.38" Diameter = 3.56"
Max voltage = 4000
Max current = 350 ma
Fil voltage = 5
Fil current = 14.5 amps GOTO INDEX