Western Electric 205D vacuum tube

Western Electric 205D vacuum tube

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Description (Brief)
Marked: "1701". In original box with instruction sheet. A moderate power triode designed for use as an audio frequency amplifier, but can also be used as an RF amplifier or oscillator. Eff = 4.5 volts; Ip = 1.6 amperes. Ep = 200 - 400 volts; Ip = 8 - 40 milliamps. Mu = 6.7 - 7.4; Rp = 3500 - 4800 ohms. Tyne notes that the locking pin on 205 type tubes was set 45o differently from other tubes to prevent low-power tubes from being inadvertently substituted. Reference: Tyne, "Saga of the Vacuum Tube," page 287.
"The No. 205D is a three-element filamentary type tube intended for use as a radio-frequency amplifier, oscillator, modulator, and audio-frequency amplifier in output stages when moderate powers are required." Reference: Western Electric 205D data sheet: https://www.westernelectric.com/s/205D.pdf.
Location
Currently not on view
Object Name
Tube, Electron
triode
vacuum tube
date made
ca 1925
Maker
Western Union Corporation
maker
Western Electric
Measurements
box: 5 3/4 in x 3 1/8 in x 3 1/8 in; 14.605 cm x 7.9375 cm x 7.9375 cm
triode: 4 1/4 in x 2 1/4 in; 10.795 cm x 5.715 cm
ID Number
EM.333211
accession number
294351
294351
catalog number
333211
Credit Line
from Western Union Corporation
See more items in
Work and Industry: Electricity
Data Source
National Museum of American History
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