Radio Antica e Radio d'epoca
212A
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Stato:
USA (Stati Uniti d'America)
|
|
| Identico a |
212A
= CW-1819
= VT-6
|
| Prime serie |
1923
Saga of the Vacuum Tube, Tyne Pages, 289 - 291.
|
| Fine produzione |
1924 |
| Sostituisce i modelli |
I_Western
|
|
Evoluzioni
|
212D
|
| Zoccolo |
Large 4 pin Bayonet
|
| Utilizzata per |
Transmittertube (Radio) |
| Filamento |
Vf 14 Volt / If 6.25 Ampere / Direct / Specified voltage AC/DC |
| Descrizione |
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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Dimensioni
(LxAxP)
incl.pins/tip |
x 345 x 92 mm / x 13.58 x 3.62 inch |
| Peso |
744 g / 26.24 oz |
| Quotazioni |
1 Quotazioni (visibili solo per gli
associati)
|
| Bibliografia |
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
Anonimo 15 Collezionista
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Numero
totale di modelli di Radiomuseum.org che
utilizzano questa valvola:1
Collezione di
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