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ID = 28853
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Triode, vacuum   Universal 
  Late but no serial production. For instance only development samples. *****
Identical to UX225 = MY227
Similar Tubes
Different connections:
Other base:
  AY225 ; AY227 ; UY227
First year Apr.1926 Saga of the Vacuum Tube, Tyne page 319, 320
Successor Tubes 1927   AY225   UY227   AY227  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1.75 Ampere / Indirect / Specified voltage AC/DC

To be used as a grid leak detector or amplifier. Top cap is a two contact Ba15S "single contact" light bulb base.Early experimental versns of this tube used a double contact Ba15D base.

Dimensions (WHD)
incl. pins / tip
x 128 x 45 mm / x 5.04 x 1.77 inch
Weight 50 g / 1.76 oz
UX225: Fin Stewart collection
Fin Stewart


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