Antique radios, Old Time Radios

UX201A

Country:	United States of America (USA)	Brand:	Common type USA tube
		Developer:	GEC, General Electric Co.; London
		Tube type:	Triode, vacuum Universal

Tube ID = 3613

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Identical to	UX201A = CX301A = AX201A = D401A = UX-201-A_Japan = 201A = 235D = ER201A = SX201A = X201A = TC201A = AWA101X = R221-DX = 201
Similar Tubes	Other shape (e.g. bulb type): 01A Normally replaceable-slightly different: 201A_Philips; 508x; AX; D-01A; SX4000; ZP201A Other base: 201A_Japan; AWA55; 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	2 Tube prices (visible for members only)
Literature	Taschenbuch zum Röhren-Codex 1948/49

UX201A: K.H.Fischer
Karlheinz Fischer

UX201A: KoBi
Konrad Birkner

Usage in Models	2= 1925?? ; 2= 1925? ; 99= 1925 ; 1= 1926?? ; 16= 1926? ; 109= 1926 ; 8= 1927? ; 75= 1927 ; 2= 1928? ; 32= 1928 ; 2= 1929?? ; 1= 1929? ; 17= 1929 ; 3= 1930?? ; 6= 1930? ; 14= 1930 ; 1= 1931? ; 2= 1932??
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 392

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