Medium-Mu Triode
The 56 Vacuum Tube is a glass type 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