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The "CV4000" numbers identify special-quality valves though SQ valves CV numbered before that rule came in retain their original CV number: CV4007 = E91AA – SQ version of 6AL5 CV4010 = E95F – SQ version of 6AK5 or EF95
Even more rarely, higher powered SETs are produced commercially, usually using the 211 or 845 transmitting valves, which are able to deliver 20 watts, operating at 1000 V. Notable amplifiers in this class are those from Audio Note corporation (designed in Japan), including the "Ongaku", voted amplifier of the year during the late 1990s.
Its initial name was the Phoenix Dynamo Co Ltd, though it immediately changed its name to English Electric Valve Company Ltd. In 1959 Bob Coulson established travelling-wave tube and microwave tube sections, and they were producing ceramic hydrogen thyratrons as well.
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