High-Mu Triode
The 3GK5 Vacuum Tube is a miniature type with a frame
grid used as a grounded-cathode RF amplifier tube in VHF
tuners of color and BW TV Receivers. They require a
miniature 7-contact socket.
Electrical Data:
Heater Voltage .......................... 2.8 V
Heater Current ......................... 0.45 A
Preferred Substitutes ............... 3FQ5, 3FY5
Substitutes ......................... 3ER5, 3ES5