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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.
A vacuum interrupter uses a high vacuum to extinguish the arc between a pair of contacts. As the contacts move apart, current flows through a smaller area. There is a sharp increase in resistance between the contacts, and the temperature at the contact surface increases rapidly until the occurrence of electrode-metal evaporation.
After the war, some of the inventions found new applications. The first transistor radio was released in 1954, and its manufacturing process made use of vacuum pumps. [43] The first integrated circuit or “chip” came to the market at the end of the 1950s, and vacuum pumps again played an important role in their production. These early ...
[1] [2] Mark Proett was an engineer whose utility patent was for B&D's Model 9321 cordless vacuum cleaner, called the Spot Vac, a component of the Mod 4 series of power tools (shrub trimmer, lantern, grass shear, drill, and Spot Vac), all powered by a single, rechargeable, and interchangeable "energy pak" handle with batteries.
Eveready 761 "C" battery with 4.5-volt, 3-volt, 1.5-volt tap screw terminals. The "C" battery is used to provide bias to the control grid. Until the early 1930s this was common practice in valve (tube) radio sets but was largely superseded by grid leak resistors or voltage divider biasing. Because the tube grids draw no current, the "C" battery ...