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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.
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.
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
Loctal tube type numbers in the USA typically begin with "7" (for 6.3-volt types) or "14" for 12.6-volt types. This was fudged by specifying the heater voltage as nominally 7 or 14 volts so that the tube nomenclature fitted. [17] Battery types (mostly 1.4-volt) are coded "1Lxn", where x is a letter and "n" a
The Roots blower is one example of a vacuum pump. A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. [1]