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Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme. Special quality variants may have the letter "S" appended, or the device description letters may be swapped with the numerals (e.g. an E82CC is a special quality version of an ECC82)
This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics.
Wherever possible, the 12V equivalent of a 6V tube had the same letters, just 12 instead of 6. L as a first letter often indicates a lock-in (Loktal) tube. P as a second letter from the end indicates a CRT. S as a first letter indicates single-ended tubes, related to grid-cap tubes. S as a second letter indicates single-ended tubes.
Vacuum Oil Company was an American oil company known [according to whom?] for their Gargoyle 600-W steam cylinder motor oil. [citation needed] After being taken over by the original Standard Oil Company and then becoming independent again, in 1931 Vacuum Oil merged with the Standard Oil Company of New York to form Socony-Vacuum, later renamed to Mobil and eventually merging with Standard Oil ...
A vacuum ejector, or simply ejector, or aspirator, is a type of vacuum pump, which produces vacuum by means of the Venturi effect.. In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area.
"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Alzheimer's disease is the most common form of dementia, affecting more than three million Americans ...
In its initial years, Edwards Vacuum imported vacuum equipment from Germany's Leybold. [2] [3] A freeze-drying method using vacuum chambers was patented in the 1930s. During World War II, the technology was further perfected and expanded to freeze-dry instant coffee, but also blood plasma and penicillin.
The country's decrepit oil-fired generation plants have struggled to keep the lights on for decades, but this year the system collapsed into crisis as oil imports dropped off from allied countries ...