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ID = 80273
United States of America (USA)
Brand: Sonatron Tube Company; Chicago and New York
Developer: Sonatron Tube Company; Chicago and New York 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to AC171A_Sonatron

Base UX-Base (4 Pins (2 thick, USA 1924, UX) 2 Sidecontacts.
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.5 Ampere / Indirect / Specified voltage AC/DC

This tube is designed to be adaptable to AC circuits. It has a flange around the top of the base. There are four screw terminal contacts in the flange in square with the normal base pins. Two are C+ and C- while the other two, which are linked by a metal strap, are for the B supply. This tube is listed in the reference as X171_Adaptor.    

Information source -- Collector info (Sammler)   
AC171A_Sonatron: Fin Stewart collection
Fin Stewart

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