Western Electric type 309A pentode
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: A pentode with 5-pin base, top contact, mesh plate. Markings: "Western Electric / USA / 309 A" "Voltage amplifier, variable-mu, suppressor-grid, pentode with indirectly heated cathode. The 309A tube is especially designed to minimize audio-frequency disturbances arising in the tube. The suppressor grid is permanently connected to the cathode within the bulb. Applications: Audio-frequency voltage amplifier, particularly in circuits in which the amplification is adjusted by varying the control-grid bias, and exceptionally low tube noise is required. Radio-frequency voltage amplifier." Reference: https://www.westernelectric.com/s/309A.pdf.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.322713
label: catalog number
content: 322713
label: accession number
content: 241556
objectType: label: Object Name
content: pentode
label: Object Name
content: vacuum tube
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 7/8 in x 1 1/2 in; 12.3825 cm x 3.81 cm