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ID = 13538
United States of America (USA)
Developer: McCullough, Frederick, S. Co.; Wilkinsburg, later Sales Company; Pittsburg 
Tube type:  Triode, vacuum   Universal 
  Ca. 1925 up to 1945 rare.
Identical to 401_McCullough = 225A = X401
Similar Tubes
Normally replaceable-slightly different:
Different connections:
  401_Hytron ; RY401
First year 1926 Saga of the Vacuum Tube, Tyne
First Source (s)
25.Jul.1925 : Saga of the Vacuum Tube, Tyne
Predecessor Tubes 400_McCullough-3volt  
Successor Tubes 227  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo) 2 Top contacts.
Was used by Radio/TV-reception etc.
Filament Vf 3 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC

Made by Kellogg for McCullough Sales Co.(McCullough was the inventor). Later (from 1929 on) manufactured by A.C.Neon Corp. of N.Y.City.
Very early AC tube. Battery set could be upgraded without deep modification, since the filament terminals were overhead, apart from the Chassis and its wiring.
Codex lists other 400' types, but not this AC type with indirect heated filament. The AC type 401 was made/sold by McCullough, Kellogg, Marathon, Marvin, and Sovereigh.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
42 x 135 x mm / 1.65 x 5.31 x inch
Weight 52 g / 1.83 oz
Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   Radio News
Tube Lore (II)   p. 33
-- Collector info (Sammler)

401_McCullough: leaflet with tube
Otto Frosinn

usa_401_kellogg_sockel_1.png 401_McCullough: O.F.
Otto Frosinn

Just Qvigstad
401_McCullough: Vintage Electronic catalog
Geri Meier

More ...
Usage in Models 3= 1926 ; 9= 1927 ; 1= 1928?? ; 1= 1928? ; 1= 1928

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):15

Collection of



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