In Europe, the principal method of numbering vacuum tubes ("thermionic valves") was the nomenclature used by the Philips company and its subsidiaries Mullard in the UK, Valvo in Germany, and Dario in France, from 1934.
Valvo was also a major German electronic components manufacturer from 1924 to 1989, one of the predecessors of NXP Semiconductors.
Valvo |
Michael Valvo (April 19, 1942 in New York – September 18, 2004 in Chanhassen, Minnesota) was an International Master of chess.