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A vacuum-tube computer, now termed a first-generation computer, is a computer that uses vacuum tubes for logic circuitry. While the history of mechanical aids to computation goes back centuries, if not millennia, the history of vacuum tube computers is confined to the middle of the 20th century. Lee De Forest invented the triode in 1906.
ECL113 – Triode - AF power pentode, Rimlock base. ECL200 – Triode - CRT drive power pentode, decal base, PCL200 with a different heater. ECL802 – Triode - Power pentode for use as vertical oscillator and output tube in TV receivers. ECL805 – Triode - Power pentode with separate cathodes, PCL805 with a different heater.
YD1336 – 1.8 kW, Air-cooled, UHF power triode. YD1342 – 30 MHz, 530 kW, Water-cooled RF power triode. YD1352S (8867, DX334) – 5 MHz, 2 kW, Water-cooled Neotron, a gridless field-effect tube where a magnetically focused electron beam is modulated by varying the voltage of a gate electrode surrounding it.
A vacuum tube, electron tube, [ 1][ 2][ 3] valve (British usage), or tube (North America) [ 4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a ...
Shark Navigator Lift-Away XL Upright Vacuum, $99 (was $199), walmart.com Hoover Smartwash Pet Carpet Cleaner Machine, $149 (was $299), walmart.com Bissell CrossWave All-in-One Multi-Surface Wet ...
Carote Kitchen Knife Set, 12-Piece. $18 $73. Save $55 with coupon. We love the neutral colors of this eye-catching knife set, which includes an 8-inch chef's knife, an 8-inch bread knife, an 8 ...
Dyson V15 Detect Absolute. $600 $750 Save $150. Type: Cordless stick. Color options: Gold. Weight: 6.83 pounds. Yes, the Dyson V15 Detect Absolute is the priciest vacuum on the list, but it comes ...
7AK7. The 7AK7 is a pentode vacuum tube (thermionic valve). According to its manufacturer, Sylvania, it was "designed for service in electronic computers". [ 1] The tube was developed in 1948, [ 2] designed at the request of L. D. Wilson for use in the Whirlwind computer. [ 3] Significant attention was directed towards its manufacturing process ...
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