CheapSlider
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Very comprehensive valve data site with a section on tube number systems
405 Line Alive has a technical page: "Decoding Valve, Transistor and CRT Numbers"
BVA = British Valve Association (- a cartel of British valve manufacturers)
405 Line Alive has a technical page: "Decoding Valve, Transistor and CRT Numbers"
BVA = British Valve Association (- a cartel of British valve manufacturers)