McCullough / Kellogg type 401 "heater" triode
date: label: date made
content: ca 1926
name: label: maker
content: McCullough Sales 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, heater type, made by McCullough of Chicago. This tube, along with the Kellogg tube [catalog number 324394], was the first successful AC heater tubes in production for use in home radio receivers for AC operation. ... These tubes were used extensively for a couple of years until tubes of the heater type on bases (types 225 and 227) were available. The 4-pin base has a cathode, plate and grid connection, while the heater circuit is connected to the two pins on the top cap."
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.324395
label: catalog number
content: 324395
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