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ID = 79343
United States of America (USA)
Brand: Cleartron Vacuum Tube; New York City, NY
Developer: Cleartron Vacuum Tube; New York City, NY 
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to CT201-RF
Similar Tubes
Normally replaceable-slightly different:
  MU20 ; RF201A_Sonatron
Other characteristic (electr. data):

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 =

Specially designed RF triode for resistance coupled aplifiers. Similar to Sonatron MU20 abd RF201A

Dimensions (WHD)
incl. pins / tip
x x 45 mm / x x 1.77 inch
Weight 47 g / 1.66 oz
Information source -- Collector info (Sammler)   
  CT201-RF: Fin Stewart
Fin Stewart
CT201-RF: Ebay item February 2019
Fin Stewart

CT201-RF: Fin Stewart
Fin Stewart


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