Power Amplifier Triode
Also known as a UX171-A and 171-A.
The 71A Vacuum Tube is a
glass type used in the output stage of audio frequency
amplifiers. It requires a four-contact socket.
Electrical Data:
Filament Voltage .................. 5 DC V
Filament Current ................... 0.5 A
Prefered Substitutes ......... UX171-A, 171, 171-A, 371, CX371,
CX371A