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Z70U/7710 – Subminiature, 3 mA avg, 12 mA peak, Gas-filled, cold-cathode DC trigger tetrode, one starter and a primer electrode, positive starter voltage, 4-pin all-glass wire-ended Z71U/7711 – Subminiature, 7 mA avg , 12 mA peak , Gas-filled, cold-cathode DC trigger tetrode, two starters, positive starter voltage, low impedance for audio ...
12AX7 (also known as ECC83 [1]) is a miniature dual-triode vacuum tube with high voltage gain.Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947.
Letter order (A-B-C) indicates increasing voltage ratings on octal-based regulators and decreasing voltage ratings on miniature-based regulators. 0A2 – 150 volt regulator, 7-pin miniature base; 0A3 – 75 volt regulator, octal base, aka VR75; 0B2 – 105 volt regulator, 7-pin miniature base; 0B3 – 90 volt regulator, octal base, aka VR90
Positive–displacement pumps, however, tend to have sufficiently tight sealing between the moving parts and the casing or housing of the pump that they can be described as self-priming. Such pumps can also serve as priming pumps, so-called when they are used to fulfill that need for other pumps in lieu of action taken by a human operator.
Sylvania Electric Products Inc. was an American manufacturer of diverse electrical equipment, including at various times radio transceivers, vacuum tubes, semiconductors, and mainframe computers such as MOBIDIC. They were one of the companies involved in the development of the COBOL programming language.
In the field of oil regeneration and re-refining, vacuum pumps create a low vacuum for oil dehydration and a high vacuum for oil purification. [44] A vacuum may be used to power, or provide assistance to mechanical devices. In hybrid and diesel engine motor vehicles, a pump fitted on the engine (usually on the camshaft) is used to produce a vacuum.