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UX221

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ID = 50831
       
Country:
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Tube type:  Triode, vacuum   Universal 
  Ca. 1925 up to 1945 rare.
Identical to UX221 = UX121

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 0.06 Ampere / Direct / Battery =
Description

The 221 is an 201A but with different filament ratings. It was made almost exclusively for export and had very little use in the United States. Due to the very low filament current required, the tube may be operated on dry cells or a storage battery. Some tubes have been found branded RCA-221 and RCA 221

 
Dimensions (WHD)
incl. pins / tip
x 108 x 45 mm / x 4.25 x 1.77 inch
Weight 47 g / 1.66 oz
Information source -- Collector info (Sammler)   
Tube Lore (II)   Page 30
 
radiotron_221_1.jpg
UX221
Roberto Guidorzi

More ...
 
01a_rca~~1.png
UX221: RCA Tube Manual
Peter Steffen

 
rca_type_221_data.png
UX221: own collection
Peter den Boer

More ...

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