It's branded Mazda and made in England, but I know Mazda was just a name put on rebranded valves. I was looking inside and thought this is a very nice construction, far better than any ECC83/12AX7 I've seen before. (E.g.the little silver bits on the plates.) Of course that doesn't mean it sounds great but some effort must have been made in the production line. I've obviously checked Mullard, who else made valves in England then?
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