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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.
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.
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).
Howard Miniature Lamp Company former location at Springfield Ave and South 19th Street, Newark, NJ after moving from East Orange in 1915. Harper had worked since 1897 with miniature lamps.
Specifications given for the EL84, PL84, and UL84 are from Philips; RCA and Sylvania list slightly higher voltage ratings for Va and Vkf and lower for Vg2 for the xCW5 series – the 6CW5/EL86, 8CW5/XL86, 10CW5/LL86, 15CW5/PL84, and 30CW5/HL84.
300B dimensions in mm. In electronics, the 300B is a directly-heated power triode vacuum tube with a four-pin base, introduced in 1938 by Western Electric to amplify telephone signals.