The KELLOGG 403 is triode with a mu of 3 that was designed with indirectly heated cathodes so that the filament would work with AC voltage. Separation was accomplished by using a separate filament socket on the top of the tube. The 403 was intended to be used as an audio amplifier tube.

Length = 5.38" Diameter = 1.50"
Max voltage = 180
Max current = 20 ma
Fil voltage = 3
Fil current = 1.5 amp         GOTO INDEX