Sharp-Cutoff Pentode
The G.E (General Electric) 1U4 Vacuum tube is a miniature
type used as a RF or IF amplifier in
lightweight, compact, portable, battery-operated
receivers. They require a miniature 7-contact socket and
may be mounted in any position.
These 1U4 Tubes are J.A.N. CKR 1U4's. They were
manufactured by the General Electric Company for the
military. They come in the original tan boxes and are
dated December 1951.
Electrical Data:
Filament Voltage ................... 1.4 DC V
Filament Current .................. 0.05 A
Preferred Substitutes .................. 5910
Substitutes ............................. 1T4