Medium-Mu Triode
The Super Airline Globe / Balloon Type 27 Vacuum tube is a glass type used as
a voltage amplifier or detector in AC-operated receivers. It was
first developed by RCA in 1937 and requires a
five-contact socket.
Electrical Data
Heater Voltage ................................ 2.5 V
Heater Current ................................ 1.75 A
Preferred Substitutes ...................................
27, 127, 227, 427, C327, D227, DE-1, ER227, GY227, UY227, UY-227_Japan
Substitutes ................................... 56