The KELLOGG 401 is triode with a mu of 10 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.
Length = 5.38" Diameter = 1.50"
Max voltage = 90
Max current = 7.2 ma
Fil voltage = 3
Fil current = 1 amp GOTO INDEX