Sharp-Cutoff Pentode
The Tung-Sol 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.
This 1U4 Tube is a JTL 1U4. It was manufactured by
the Tun-Sol Corporation for the military. It comes in
its original tan box and is dated October 1951.
Made in the Good Ol' USA!
Preferred Substitutes ......................... 5910
Substitutes ................................... 1T4