Grounded Grid Triode
The 6J4 Vacuum tube is a miniature type used as a
grounded-grid UHF amplifier at frequencies up to 500 MHz.
It requires a miniature 7-contact socket.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.4 A
Preferred Substitutes ..................... 8532
Substitutes ...................................
7137, 7245.