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UX201A

Information - Help 
ID = 3613
       
Country:  United States of America (USA)      Brand: Common type USA tube/semicond.
  Developer:  GEC, General Electric Co.; London 
  Tube type:  Triode, vacuum   Universal 
Identical to UX201A = GX201A = CX301A = AX201A = D401A = UX-201-A_Japan = 201A = 235D = ER201A = SX201A = X201A = TC201A = AWA101X = R221-DX = 201 = MX201A_Marathon = 401A_deForest
Similar Tubes Other shape (e.g. bulb type):
 01A
Normally replaceable-slightly different:
 201A_Philips; 508x; 5VAX; AX; D-01A; SX4000; ZP201A
Other base:
 201A_Japan; AWA55; DC201A; R221-D
First year   Aug.1925 Saga of the Vacuumtube, Tyne page 315.
Predecessor Tubes UV201A  
Successor Tubes 01A   UX240   UX226   226  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery = /
Description Tyne page 308ff brings the details of history. Here the main points only: The first tubes RCA is marketing in 1920 are the detector tube UV200 with argon gas filling and the UV201 Amplifier. Manufacturer was General Electric (GE).

In 1922 GE replaces the UV201 with the UV201A, having now a thorium filament.

In August 1925 this tube comes with a new base and standardised construction (of 1923) for neutrodyne apparatus and is then called UX201A (short name 201A - which should not to be confused with the Western Electric 201A, the Myers tube 201A and the "Star Tube" 201A). Cunningham is naming the tube CX301A.

By having the tube with a shoulder type glass envelope (dome type) in 1932 the designation is changed to 01A. 
Text in other languages (may differ)
Tube prices 9 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   

  ux201a_detector_sch.png
  UX201A: RCA
Heribert Jung
ux201a_2.jpg
UX201A: K.H.Fischer
Karlheinz Fischer

 
Variants
 
uxsockel_11.png
UX201A: KoBi
Konrad Birkner

 
ux201a_data1.png
UX201A: eigenes Dokument
Roland Böhme


Usage in Models 3= 1924 ; 2= 1925?? ; 9= 1925? ; 121= 1925 ; 2= 1926?? ; 33= 1926? ; 145= 1926 ; 1= 1927?? ; 10= 1927? ; 94= 1927 ; 5= 1928? ; 39= 1928 ; 2= 1929?? ; 1= 1929? ; 20= 1929 ; 1= 1930?? ; 5= 1930? ; 16= 1930 ; 1= 1931? ; 2= 1932?? ; 8= 9999
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):520

UX201A*Box

collezione privata
Davide Casarosa

collezione privata
Davide Casarosa

collezione privata
Davide Casarosa

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