Medium-Mu Triode
The RCA Cunningham (Radiotron) Globe 56 Vacuum Tube is a glass
type with an Etched plastic base. It is used as a detector, amplifier or oscillator in
ac-operated receivers. It requires a five-contact socket.
This type is identical electrically to the 76 vacuum Tube.
Electrical Data:
Heater Voltage ................................ 2.5 V
Heater Current ................................ 1.0 A
Substitutes .................... 27