The 5Y3GT Tube is a glass octal type used in power supply of radio equipment
having moderate dc requirements. Requires an octal
socket. Vertical tube mounting is preferred, but
horizontal opration is permissible if pins 2 and 8 are
in horizontal plane.
Electrical Data:
Heater Voltage ................................ 5.0 V
Heater Current ................................ 2.0 A
Preferred Substitutes .............. 5AX4 5AZ4 5R4
Substitutes .................................. 5U4, 5u4GB