Antique radios, Old Time Radios

DV2

Country:	United States of America (USA)	Brand:	DeForest-Tubes
		Developer:	General Electric Co. (GE); Bridgeport (CT)
		Tube type:	Triode, vacuum Universal

Tube ID = 19547


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Identical to	DV2
Similar Tubes	Normally replaceable-slightly different: C301A; UV201A Heater and shape different: C301; UV201 Other base and data slightly different: DL2_deForest
First Series	Sep.1923 Saga of the Vacuumtube, Tyne page 301

Base	UV-Base (4 Pins+Bayonet, USA 1914)
Was used by	Radio/TV-reception etc.
Filament	Vf 5 Volts / If: 0.3 Ampere / -: Direct / -: Battery = /
Description	Tyne page 308ff brings the details of history. Here the main points only: The first tubes RCA is marketing in 1920 are the detector tube UV200 with argon gas filling and the UV201 Amplifier. Manufacturer was General Electric (GE). Both tubes are operated with a filament current of 1 ampere and at 5 volts. Both have pear-shaped bulbs and are tipped. The base has a mantle of brass with a ceramic insert in thich the pins are imedded. Cunningham is naming his as C-300 and C-301. DeForest uses DV2 as name for the UV201. V stands for the UV-base. In 1922 GE replaces the UV201 with the UV201A, having now a thorium filament. In 1925 this tube comes with a new base and standardised construction (of 1923) for neutrodyne apparatus and is then called UX201A. Cunningham is naming the tube CX301A. By having the tube with a shoulder type glass envelope (dome type) in 1932 the designation is changed to 01A. The 01A marks the end of this line of tubes. Text in other languages (may differ)
Literature	Saga of the Vacuumtube, Tyne

KoBi
Konrad Birkner

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DV2

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