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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.
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 ...
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.
EF9 – Pentode, EF22/7B7, EF39/6K7 or EF41/6CJ5 with a side-contact 8 base with control grid on top cap; EF11 – Remote-cutoff pentode, Y8A 8-pin steel tube base; EF12 – Pentode, Y8A 8-pin steel tube base; EF13 – Remote-cutoff pentode; EF14 – Sharp-cutoff pentode, Y8A 8-pin steel tube base, identical to UF14 and VF14 except for heater ...
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 ...
List of vacuum-tube computers. EDSAC. Vacuum-tube computers, now called first-generation computers, [ 1] are programmable digital computers using vacuum-tube logic circuitry. They were preceded by systems using electromechanical relays and followed by systems built from discrete transistors. Some later computers on the list had both vacuum ...
Rogers Vacuum Tube Company. Rogers Vacuum Tube Company (formally named Radio Manufacturing Corporation Limited) was founded as the Standard Radio Manufacturing Corporation in 1925 by Edward Rogers (1900–1939) to sell Rogers "Batteryless" radios using vacuum tube technology. [1] [2] It was later renamed Rogers Majestic Corporation Limited when ...
6AQ5. The 6AQ5[ 1] ( Mullard–Philips tube designation EL90) is a miniature 7-pin (B7G) audio power output pentode vacuum tube with ratings virtually identical to the 6V6 at 250 V. [ 2] It was commonly used as an output audio amplifier in tube TVs and radios. It was also used in transmitter circuits. [ 3] There are versions of this tube with ...
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