01A, Tube 01A; Röhre 01A (01A)

Antique radios, Old Time Radios

01A

Country:	United States of America (USA)	Brand:	Common type USA
		Developer:	RCA (RCA Victor Co. Inc.); New York (NY)
		Tube type:	Triode, vacuum Universal

Tube ID = 3654


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Identical to	01A = 201A = D401A = 201 = ER201A = C509A = C509 = 301A
Similar Tubes	Other shape (e.g. bulb type): AX201A; UX-201-A; UX201A Normally replaceable-slightly different: 38001; A_Common Other base: C509_B4
First Series	1932 -- Other type before this -same/similar characteristics - see exchange. Radios von gestern Seite 211, Domform
Predecessor Tubes	UX201A CX301A GX201A

Base	UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by	Radio/TV-reception etc.
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 1925 this tube comes with a new base and standardised construction (of 1923) for neutrodyne apparatus and is then called UX201A. 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. The 01-A or 01A as we write it is a storage battery triode used as detector or amplifier. Operating as grid-resistor detector are: plate volts = max. 45, grid resistor 2 or 3 megohms, grid capacitor 250 pF and grid return to filament plus. As biased detector, type 01-A has plate volts of 135 max, bias fo approx. - 13,5 volts. As amplifier, it has plate volts of 135 max., bias of - 9 volts. Filament takes 5 volts with 0.25 amperes. Text in other languages (may differ)
Tube prices	0 Tube prices (visible for members only)
Literature	Essential Characteristics, GE 1973 Taschenbuch zum Röhren-Codex 1948/49 Babani, International Radio Tube Encyclopaedia


	MK-Röhrentabelle Daniel Consales

Own collection
Eduard Abfalterer

W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe

Sylvania Rec. Tubes Manual 1944
Daniel Consales

Usage in Models (calculation each 25th of the month)	1= 1923 ; 1= 1924?? ; 12= 1924 ; 35= 1925 ; 50= 1926 ; 2= 1927? ; 44= 1927 ; 1= 1928? ; 13= 1928 ; 2= 1929?? ; 1= 1929? ; 8= 1929 ; 6= 1930?? ; 6= 1930? ; 10= 1930 ; 1= 1931? ; 3= 1932?? ; 3= 1932? ; 9= 1932 ; 1= 1933?? ; 1= 1934?? ; 1= 1934 ;
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 211

Further Information for

01A

Short Illustrated History of the 01A (01A) (17.01.2006) Konrad Birkner	Clicks: 744 Replies: 0
RCA UV200 (Argon-gas filled at 0,05 mm Hg), and UV201 (vakuum) had brass base and tip; 1 amp @ 5 volt filament. Marketed by RCA. announced in November 1920 and advertised for sale in December 1920. ---------------------------------------------------------------------------------- UV201A (vakuum) from October 1922, brass base, tipped. Filament took .25 anp @ 5 volt. From mid 1924 on bakelite base, no more tip. both types UV201A ---------------------------------------------------------------------------------- The new UX based tubes were throughout untipped and used a Bakelite base. UX201A (vakuum) from August 1925; .25 amp @ 5volt, and UX200A (caesium vapor) from April 1926; .25 amp @ 5 volt. UX200A UX201A ------------------------------------------------------------------------------------- Cunningham distributed the same tubes types but under different denomination: C in place of UV and CX instead of UX. Furthermore the 20x numbers became 30x. Consequently C300 = UV200 und CX301 = UX201. Cunningham CX301 ------------------------------------------------------------------------------------- Nomenclature Soon an abbreviated name came into everydays use for the practically identical tubes having different names. They were simply called the 01 or '01. That can be found even printed on schematics etc. It was kind of a generic name. Officially this name 01A appeared around 1932 for the shoulder or dome type glass envelopes. '01A with "shoulder" (dome type) RCA had initially no tube manufacturing. They marketed tubes made by Westinghouse or General Electric as a distributor, but under their own brand "Radiotron". Cunningham was also involved in that nearly monopolistic business. In 1930 RCA eventually established the " RCA Radiotron, Inc ." as their own manufacturing subsidiary. Replacement since the 01A is a perfect functional replacement for a.m. tubes, it is not really an error if it is called for a radio before 1932. But anyway we should always try to state the coincident tube types for the models. Ref.: Saga of the Vacuum Tube Photos: Authors collection

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