Daven type MU20 vacuum triode
date: label: date made
content: ca 1927
name: label: maker
content: Daven Radio Co.
notes: label: Description (Brief)
content: A 4-pin plastic base with short pins, silvered oval-shaped envelope. Paper label on tube reads: "Fil. Volts 6 Fil. Amp. 1/4 / Daven Tube / MU 20 / Warning: / Positively no / adjustments if / this label is removed. / No. 44614 / Daven Radio Corporation . Trade Mark Reg. / Dist. Test [blank] / Dealer test [blank]". Donor's card reads: "Triode made for the Daven Radio Corporation of Newark, N.J. in the 1920s. The Daven Corporation being primarily a source of good quality resistors for radio use, developed this tube for use as a resistance coupled radio or audio frequency amplifier. Combined with the right resistors and condensers, these tubes provided excellent amplification. Five volt filament at .25 ampere. A 1925 advertisement says "The MU-20 increases the amplification of the Daven Super-Amplifier (3 stage resistance coupled) to equal or exceed that obtained with transformer coupling (using an MU-6 tube in the output stage)." A Super-Amplifier cost $15.00, the MU-20 tube $4.00 each, and the MU-6 cost $5.00 each." See also: https://www.radiomuseum.org/tubes/tube_mu20.html.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.324389
label: catalog number
content: 324389
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: triode
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 1/8 in x 1 3/4 in; 10.4775 cm x 4.445 cm