DocumentCode
1232886
Title
Statistical Evaluation of Life Expectancy of Vacuum Tubes Designed for Long-Life Operation
Author
McElwee, Eleanor M.
Author_Institution
Sylvania Electric Products Inc., Kew Gardens, L.I., N.Y.
Volume
39
Issue
2
fYear
1951
Firstpage
137
Lastpage
141
Abstract
Life-test data on subminiature vacuum tubes designed for 5,000 hours are analyzed statistically and an equation is derived for the curve of life survival percentages. Correlation of individual types to the general curve is found to be extremely high. Controls are determined for normal 500-hour life tests which assure rated long-life quality and are presented as a method for evaluating life expectancy before completion of long-life tests. Life test samples of lots of tubes released by this 500-hour plan were continued in operation for 5,000 hours, and the results are shown to be satisfacfactory.
Keywords
Aggregates; Design engineering; Electron tubes; Equations; Life estimation; Life testing; Manufacturing; Process design; Reliability engineering; Technological innovation;
fLanguage
English
Journal_Title
Proceedings of the IRE
Publisher
ieee
ISSN
0096-8390
Type
jour
DOI
10.1109/JRPROC.1951.231089
Filename
1701438
Link To Document