McCullough / Kellogg type 401 "heater" triode
date: label: date made
content: ca 1926
name: label: maker
content: Kellogg Switchboard and Supply Company
notes: label: Description (Brief)
content: A double-ended tube with a plastic 4-pin base and a 2-pin plastic top cap. S-shaped envelope. Donor's card reads: "Triode made by the McCullough interests for the Kellogg Switchboard & Supply Company of Chicago in the 1920s. Identical with the McCullough tube [catalog number 324395]. This tube bears the name Kellogg.... Also similar to [catalog number 324396]. One of the first successful tubes to operate from an AC source for home receivers. Developed to eliminate the battery charging nuisance, this heater tube worked efficiently and with an acceptable minimum of hum. Mounted on a standard UX long pin base, with plate and grid connected to the usual pins (for battery operation) and the cathode connected to one of the filament pins, this tube could be inserted as a replacement for the UX-201-A battery operated tube. Heated current was fed to the two pins on the top cap from a harness with snap connectors which ran from tube to tube. Not only used as replacements for battery tubes, this tube was supplied as standard equipment by several set manufacturers [including] Spartan, Majestic, and others before 1930."
label: Description (Brief)
content: Reference: Tyne, "Saga of the Vacuum Tube," page 358: Distributed by McCullough Sales Co., Pittsburgh (1925), in 1926 they have offices in NYC & Chicago, Sept. '26 address is Brooklyn). In Feb. '26 tubes are made by Kellogg Switchboard & Supply Co., Chicago, and in June '29 tubes are made by A. C. Neon Corp., NYC. See also: https://www.radiomuseum.org/tubes/tube_401.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.324394
label: catalog number
content: 324394
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: 5 1/4 in x 1 5/8 in; 13.335 cm x 4.1275 cm