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https://www.nonstopsystems.com/radio/pdf-hell/article-IRE-3-1947-Gorham.pdf
Electron Tubes in World WarII* ... centimeter for several hundred hours in laboratory tubes. Thehighest peakemission reported is about 140 amperes per square centimeter. Oxide-cathode direct- ... tube life is usually less than 100 hours, although efficiencies are about 40 per cent.
https://www.manta.com/mb_44_E229F_05/electron_tubes/california
Penta Laboratories was founded in 1951, and quickly achieved industry-wide recognition for the development of the beam-power Pentode vacuum tube. Today, on the dawn of the 21st Century, Penta Laboratories is a world class manufacturer and distributor of …
Penta Laboratories has been the worldwide leader in vacuum tubes, electron tubes and capacitors since 1951. Over the past 70 years we have stayed true to our mission which is to provide premium quality products along with an exceptional customer experience. Penta Labs is the top source for tubes in the medical, scientific, industrial, audio ...
https://www.westernelectric.com/blog/application-note-11202020
The filament of a Western Electric 300B is aged or “burned-in” for nine hours following strict procedures established by Bell Laboratories engineers. While this initial duration is sufficient to meet quality control standards, a 300B sometimes requires additional time, in some cases up to 500 hours, to reach its full potential during music playback.
https://www.westernelectric.com/
Western Electric was established in 1869. It was re-established in 1996 for the exclusive manufacture of electron tubes and high fidelity. Weaved into our story of American manufacturing is the story of sound itself. From the earliest glow of the vacuum tube to the advent of hi-fi, we make stunning experiences for listeners worldwide.
https://www.westernelectric.com/library
Principles of Electron Tubes - This introductory yet comprehensive study of modern electron tubes emphasizes basic physical principles, and gives a clear picture of how electron-field interactions lead to useful device performance of special value to engineers …
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