Antique radios, Old Time Radios
212A
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Country:
United States of America (USA)
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| Identical to |
212A
= CW-1819
= VT-6
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| First year |
1923
Saga of the Vacuum Tube, Tyne Pages, 289 - 291.
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| Production stop |
1924 |
| Predecessor Tubes |
I_Western
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Successor Tubes
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212D
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| Base |
Large 4 pin Bayonet
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| 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.
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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)
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| 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
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212A: Electrical Communication Vol.3 No.2, January 1924
Georg Richter
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212A: Fin Stewart
Fin Stewart
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212A: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
Collection of
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