POWER PENTODE
The 3Q4 Vacuum Tube is a miniature type used in the output
stage of lightweight,
compact, portable, battery-operated equipment.
It requires a miniature 7-contact socket. Except for
basing, it is identical to 3V4.
Electrical Data:
Heater Voltage ..................... 1.4/2.8 DC Volts
Heater Current .................... 0.1/0.05 Amps
Preferred Substitutes ................... 3W4
Substitutes ......................... 3A4 3Z4