Sharp-Cutoff Pentode
The RCA 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 JRC 1U4's. They were manufactured by
the RCA Victor division for the military. They come in the
original tan boxes and are dated 1952.
Electrical Data:
Filament Voltage ................... 1.4 DC V
Filament Current .................. 0.05 A
Preferred Substitutes .................. 5910
Substitutes ............................. 1T4