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ID = 13502
United States of America (USA)
Common type USA tube/semicond.
Common type USA tube/semicond. Castilla; Madrid Ace Electrical Laboratory; Newark, NJ Advance Battery Corp.; Brooklyn Air Castle - tubes Air King - tubes Air Scout - tubes Airhawk - tubes Airline, Super-Airline, Wards (tubes) - see also Montgomery Ward; Chicago, IL Airtron, H. & H. Radio Co.; Newark, NJ Alltron (tube brand), Allan Manufacturing Co.; Arlington and Harrison, NJ Amplitron = Tube brand Apollo Radio Tube Company; New York City, NY, Irvington, NJ Argon (Tube brand) Arrow Tube Company; Springfield, MA Atlantic and Pacific Radio Corporation; New York City, NY Bear Radio Products Corp.; New Jersey Belltone = Tube brand Blackstone Radio Tube; Pawtucket, RI Buck (tube brand) CeCo (tubes), C.E. Mfg. Co. Inc.; Providence, RI Champion Radio Works; Danvers, Massachusetts Claradyne; (Where ?) Columbia Radio Laboratories Inc. (Columbiatron); New York City, NY Continental Corp. (Continental tube brand); Chicago, IL Daven Radio Co. ; Newark (NJ) Defender (tubes) - see also Sears; Chicago, IL Diatron (tubes), Diamond Vacuum Products Co; Chicago, IL D-Lux Blue (tube brand) Duraco (tubes), Duratron Products Corp.; Union City, NJ Echotron (tubes); (where ?) Everbest Radio Corp.; New York, NY Falck (only tubes), Advance Electric Co.; Los Angeles, CA - for models see under Advance Electric Federal Electric and Radio Co.; New York City, NY Fields, Henry; Shenandoah, IA Globe Electric Co. (Kleer-Tone); Newark, NJ Gloria Tube Works; Newark, NJ Gold Bond (tube brand) Gold-Tone Radio Company; New York City, NY Green Seal (tubes), Air-Way Electric Appliance Corp.; Toledo, OH Greentron (tubes) Gurney Seed & Nursery Co.; Yankton, SD Hickory (tube brand); (Where ?) Hylon (tubes), brand Hytron; Salem (MA) Jewel Radio Company; New York, NY JRC, Johnsonburg Radio Corporation; Johnsonburg, PA KMA, May Seed and Nursery Co.; Shenandoah, IA Knight (tubes), brand Kwik-lite (Kwiklite), Usona Manufacturing Co.; Toledo, OH Lafayette Radio & TV Corp; New York (NY) Legion (Tube brand); (Where ?) Loraco (tubes), George Loring; Chicago Magnatron, Connewey; Hoboken N.J. Music Master Corp. (pre 1927); Philadelphia Myers, E.B. Ltd.; Cleveland (Myers4) Neontron Co.; New York City, NY Neptune Tube Works; Newark, NJ Panama (tubes) Peak Radio Tube (tube brand) Pioneer Engineering Laboratories; Jersey City, NJ Powertone (brand): Barfield Electrical Laboratories, New York NY Premier Vacuum Tube Co.; Chicago, IL QRS Music Company; Chicago, IL Quaker Radio Tubes, Gardiner & Hepburn; Philadelphia, PA Qualitron Manufacturing Co.; Newark, NJ Radio Knight, Chisholm-Barfield Corp; New York City, NY Real Tone Tube Co.; Pawtucket, RI Regal Products Corp. (Regaltone, Regal-Tone); Philadelphia, PA Rextron Radio Corporation (tube brand); Chicago Royal Blue Tube Laboratories; Newark New Jersey Royal Tube Co.; Pawtucket, RI Seaver-Williams Co.; Boston, MA Shelby Radio Tube Co.; Shelby, OH Silvertone (tubes) - see also Sears; Chicago, IL Sky Sweeper, Charles R. Ablett Co.; New York, NY Songbird (brand) Sovereign Electric & Mfg. Co.; Chicago Sparton-Cardon Tubes; Jackson MI Speed, Cable Radio Tube Corp. / Cable Supply Co.; New York and Brooklyn, NY Star Radio Tube Co.; Chicago, IL Supertron Manufacturing Co. Inc.; Hoboken, NJ The Talker (tube brand) Thorola, Winkler-Reichmann Co.; Chicago, IL Trail Blazer (tubes), Montgomery Ward; Chicago, IL Triad Television & Mfg. Co.; Pawtucket, RI Van Horne Tube Company; Franklin, OH (see also Musselman) Vogue Nonpareil (tube brand), Allan Manufacturing Co.; Arlington and Harrison, NJ Volutron (tube brand) Walco, Star Engineering Co; Arlington, NJ Western Quality Tubes; (Where?) WRC, Conway Electrical Laboratories; New York City, NY
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Universal 
Identical to 201A = 201 = RH201A = LS201A = HF201A_perfectron = BG-201A = TS201A = F201A = FX201A = CX201A = GSX401A = 4600 = MX201A = JX201A = 3000X1-A = VX201A = TSX201A = SW201A = LB-201A = P201A = SX01A = SLX201A = XL201A = D201A = G&R201A = NX-201A = ZP201A = RayX-201A = T-201A = D-201A = EX201A = Z201A = A_MusicMaster = 01A = UX201A = CX301A = ER201A
Similar Tubes
Other shape (e.g. bulb type):
  DX-235 ; M-201A ; RedTop_UX
Normally replaceable-slightly different:
  201A_Magnavox ; 38001 ; A57
Heater different:
Differences not known by us:
First year Aug.1925 Saga of the Vacuum Tube, Tyne page 315.
Predecessor Tubes UV201A  

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 =

201A is a short name for the UX201A, which was replacing the UV201A in August 1925 (Tyne page 315).

Do not confuse with the 201A by Western Electric, which is completely different!

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 108 x 45 mm / x 4.25 x 1.77 inch
Weight 47 g / 1.66 oz
Tube prices 10 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   

201a_sock.png 201A: O.F.
Otto Frosinn

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Just Qvigstad
201A: Vintage Electronic catalog
Geri Meier

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Usage in Models 5= 1925?? ; 1= 1925? ; 6= 1925 ; 1= 1926?? ; 8= 1926? ; 9= 1926 ; 1= 1927?? ; 3= 1927? ; 11= 1927 ; 4= 1928?? ; 4= 1928? ; 12= 1928 ; 9= 1929? ; 10= 1929 ; 1= 1930? ; 8= 1930 ; 1= 1931?? ; 1= 1931 ; 1= 1933??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):96

Collection of




Larry told us: Base dia. 33 mm; ht. 34 mm; Glass itself ht. 60 mm; while pin length is 14 mm. This tube is identical to the M-201A made by Mastertone, except for the label. It was most probably made by Mastertone. The brand is listed in the latest "master list" of 201A tubes compiled by Hal Kravig in 2012.

Mit blauem Glas.

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