Western Electric type 205D vacuum triode
date: label: date made
content: ca 1925
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: 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. Brass shell 4-pin base with plastic insulator. Tipped G-shaped envelope. Stamped on envelope: "Western Electric / Made in U.S.A. / 205-D / Pat. in U.S.A. / 1-15-07 / 2-18-08 / 10-17-16 / 12-19-16 / 12-17-18 / 1-27-20 / 10-5-20 / Pats. Applied For / 8-21-23". 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.
label: Description (Brief)
content: "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.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: ZZ.RSN80510U01
objectType: label: Object Name
content: triode
label: Object Name
content: electron tube
label: Other Terms
content: Electron Tube Electron Tube; Electron Tubes
physicalDescription: label: Physical Description
content: composition (overall material)
label: Physical Description
content: glass (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 4 1/4 in x 2 1/4 in; 10.795 cm x 5.715 cm