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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.
The company expects the American-made tubes to be more expensive than compatible tubes from Russia or China. It confirmed that it has no intention of expanding manufacture outside of the United States. [5] [6] According to a Wired article from March, 2023 the first new U.S. made small signal tubes manufactured will be the type 12AX7. [7]
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)
A Curristor vacuum tube that had four types of nitrogen-filled, radioactive constant-current tubes with a current plateau from 25 to 500 V, all-glass wire-ended, active material is 226Ra with a half-life of 1601 years, for linear capacitor charging and draining in missile and ordinance mine timing circuits, instrumentation biasing, as current ...
Amperex tubes were original equipment parts in many models of Tektronix and Hewlett-Packard test equipment. Although Amperex stopped making vacuum tubes long ago, hoards of new old stock (especially the original "Bugle Boy" series) are traded for profit, and other manufacturers produced compatible tubes more recently.
The San Francisco Bay area was one of the early centers of amateur radio activity and experimentation, containing about 10% of the total operators in the US. Amateur radio enthusiasts sought vacuum tubes that would perform at higher power and on higher frequencies than those then available from RCA, Western Electric, General Electric, and Westinghouse. [1]
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