Eimac / Signal Corps type VT158 "Zahl" tube
date: label: date made
content: ca 1943
label: date made
content: ca. 1943
name: label: maker
content: Eimac
notes: label: Description (Brief)
content: A horizontal glass cylinder, end tipped, with two contact stems on top and six stems on the bottom, two of which have a single lead, the other four having dual leads. Marked on envelope: "Eimac / Reg. / U.S.Pat.Off. / VT 158 / Made in U.S.A." On end: "H4-44094", on stems: "H4-24153 H4-25566 H4-25532 I4-11632". Donor’s card reads: “Triode pulsed oscillator with internal resonant circuit, sometimes referred to as a “Zahl Tube” after its developer, Lt. Col. Harold A. Zahl. Made by Eitel-McCollough of San Carols, Calif., for the US government during World War II. Filament voltage 10 at 10 amps to each unit (total 40 amperes per tube). Thoriated tungsten filament. Maximum ratings in pulsed service: DC plate voltage up to 35000 volts depending on duty ratio and subject to the following ratings: power input 500 watts, estimated peak power output 100 kw, Requires 60 CFM of air for cooling. This tube contains four filaments, four grids and four plates built into a push-pull circuit. Two grids are connected directly to the small lower bar on each side of the tube, and in a similar manner two plates are connected on each side of the larger bar, completing these two circuits for the 600 megacycle frequency."
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.324697
label: catalog number
content: 324697
label: accession number
content: 252994
objectType: label: Object Name
content: triode
physicalDescription: label: Measurements
content: overall: 7 3/8 in x 8 in x 3 1/2 in; 18.7325 cm x 20.32 cm x 8.89 cm