National Union type 1299 / 3-D-6 / VT-185 pentode
date: label: date made
content: ca 1943
name: label: maker
content: National Union Radio Corp.
notes: label: Description (Brief)
content: A 7-pin metal base with T-shaped envelope. Donor’s card reads: “Pentode made by the National Union Radio Company for the US government during World War II. Also known as type VT-185. Glass lock-in type used as a beam power tube for audio output amplification in battery operated radio receivers. Filament center tapped, 1.4 or 2.8 volts at .22 or .11 ampere, respectively. As a Class A amplifier, 150 volts at 8 milliamps on the plate, 4.5 volt negative grid bias, for an audio output of .6 watt.” See also: https://www.radiomuseum.org/tubes/tube_3d6.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.325190
label: catalog number
content: 325190
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: pentide
label: Object Name
content: pentode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 2 5/8 in x 1 1/4 in; 6.6675 cm x 3.175 cm