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ID = 80339
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   RF/IF-Stage 
Identical to RF201A_Sonatron
Similar Tubes
Normally replaceable-slightly different:
  CT201-RF ; MU20

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =

This tube is a specially designed type for resistance coupled amplifiers. It has a tubular bulb.

Information source -- Collector info (Sammler)   
  RF201A_Sonatron: Fin Stewart
Fin Stewart
RF201A_Sonatron: Fin Stewart collection
Fin Stewart

RF201A_Sonatron: Fin Stewart
Fin Stewart


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