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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. Many industrial, military or otherwise professional tubes were also produced.
As of 2022, KT88 valves are produced by New Sensor Corporation (Genalex Gold Lion [3] and Electro-Harmonix brands) in Saratov, Russia, JJ Electronic [4] in Čadca, Slovakia and Hengyang Electronics [5] (Psvane brand) at former Guiguang factory in Foshan, China. NOS examples in good condition are extremely rare.
The 1937 6F8G [2] was also an octal-based double triode with essentially the same characteristics as the 6SN7 (or two 6J5's), but in a 'Coke Bottle' large (Outline ST-12) glass envelope with a different pin arrangement and utilising a top cap connection for the first triode's grid (making pin 1 available for a metal shield).
Circuit symbol of a heptode. The development of the pentagrid or heptode (seven-electrode) valve was a novel development in the mixer story. The idea was to produce a single valve that not only mixed the oscillator signal and the received signal and produced its own oscillator signal at the same time but, importantly, did the mixing and the oscillating in different parts of the same valve.
Radio Valve Co. of Canada Ltd., 1954 : RMA #859A. 5992 – Premium, ruggedized 6V6GT with heater current raised to 600mA. Bendix and GE known manufacturers. 7408 – 6V6GT with additional zero-bias characteristics. 6V6S – A modern production, large plated tube, heater current 500mA, with a higher plate and screen voltage rating.
The 6N2P is not a pin-compatible replacement for the 12AX7 - an adapter (Or rewiring the valve socket) is required. The amplification factor of 6N2P is 98 which is marginally lesser than 12AX7 , its higher heater current draw is similar to a 5751 .
The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, who were owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...
The 12AU7 and its variants are miniature nine-pin (B9A base) medium-gain dual-triode vacuum tubes.It belongs to a large family of dual-triode vacuum tubes which share the same pinout (RETMA 9A).