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01A

Information - Help 
ID = 3654
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Triode, vacuum   Universal 
Identical to 01A = 201A = D401A = 201 = ER201A = C509A = C509 = 301A = VT-30 = DC201A = CV750 = 401A = 4600 = MX201A
Similar Tubes
Other shape (e.g. bulb type):
  AX201A ; M01A ; UX-201-A_Japan ; UX201A
Normally replaceable-slightly different:
  01AA ; 38001 ; A_Common ; C-201A
Other base:
  C509_B4
First year 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)
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 1 Tube prices (visible for members only)
Literature Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia

  01a_umgebung.png
  01A: MK-Röhrentabelle
Daniel Consales
 
philco_01a.jpg
01A: O.F.
Otto Frosinn

 
Variants
 
s_217_g.gif
01A: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe

 
01a_daten.png
01A: Sylvania Rec. Tubes Manual 1944
Daniel Consales


Usage in Models 1= 1925? ; 2= 1927 ; 3= 1932?? ; 4= 1932? ; 8= 1932 ; 1= 1933?? ; 1= 1934?? ; 4= 1934 ; 1= 1935? ; 2= 1935 ; 1= 1937?? ; 2= 1937 ; 1= 1938
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):31

01A*Box

O.F.
Otto Frosinn
   

  Variants


My own collection
Antonio MARRA
01A*Blue Arcturus

Variant in blue made by Arcturus USA.Same electrical characteristics of base model 01A, same pin arrangement and UX base.

28.Feb.2013 Antonio MARRA

 
01A*metal-glass

Metal coated cylindrical glass version. Complete name: M01A. The letter "M" appears only on the boxes and enclosed paperwork, not on the tubes. Please klick here: M01A

29.Jun.2014 Otmar Jung

   

Forum contributions about this tube
01A
Threads: 1 | Posts: 1
Hits: 1998     Replies: 0
Short Illustrated History of the 01A (01A)
Konrad Birkner
17.Jan.06
  1 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
 
01A
End of forum contributions about this tube

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