The Realistic 5Y3GT Vacuum Tube is a glass octal
type used in the power supplies of radio equipment
having moderate DC requirements. They require an octal
socket. Vertical tube mounting is preferred, but
horizontal opration is permissible if pins 2 and 8 are
in horizontal plane.
The West German Variety were manufactured by Amperex and
Telefunken.
Electrical Data:
Heater Voltage ................................ 5.0 V
Heater Current ................................ 2.0 A
Preferred Substitutes .............. 5Y3G, 5Y3S,
5AX4, 5AZ4, 5R4.
Substitutes .................................. 5U4