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212A

Information - Help 
ID = 17456
       
Country:
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Transmitting Triode, air cooled   Universal 
Identical to 212A = CW-1819 = VT-6
First year 1923 Saga of the Vacuum Tube, Tyne Pages, 289 - 291.
Production stop 1924
Predecessor Tubes I_Western  
Successor Tubes 212D  

Base Large 4 pin Bayonet
Was used by Transmittertube (Radio)
Filament Vf 14 Volts / If 6.25 Ampere / Direct / Specified voltage AC/DC
Description

Tyne page 289-291: The experimental Type I tube was the forerunner of the Western Electric tube 212A, rated at 250 watts. Size about 13 5/8 inches high, 3 5/8 in diameter. Used as oscillator or modulator. Filament current 6.24 amperes at 12.5 to 14 volts. Anode 1500 volts for the current of 100-150 milliamperes - with an amplification factor of about 16 at an internal anode impedance of 2000 ohms. Assigned as CW-1819 by the Navy and VT-6 by the Signal Corps.

The 219A was the counterpart for the 212A as a rectifier, starting commercially in 1923 and we assume therefore that the 212A started in the same year. The 212A was replaced in 1924 by the 212D with a new filament for not having to classify for a filament resistance - and that tube lasted - inclusive the counterpart 219D from 1926 into the 1930s.

 
Dimensions (WHD)
incl. pins / tip
x 345 x 92 mm / x 13.58 x 3.62 inch
Weight 744 g / 26.24 oz
Tube prices 1 Tube prices (visible for members only)
Information source Tube Lore (II)   p. 234
Saga of the Vacuum Tube, Tyne   Pages, 289 - 291.
Tube Lore (I)
Taschenbuch zum Röhren-Codex 1948/49

212a_western_umg.png
212A: Electrical Communication Vol.3 No.2, January 1924
Georg Richter

212d_pin_ass.~~2.png 212A: Fin Stewart
Fin Stewart

212a_spec.png
212A: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Usage in Models 1= 1929?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of

 
212a.jpg

212A
 

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