Isaacc7
1000+ Head-Fier
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They did make their own tubes. These particular tubes were labled a bunch of different things. I have them labeled as a Cossor 807, an ATS25, and a VT60A. You’ll also see them labeled GEC. Apparently Mazda made them as Cossor just couldn’t make them well enough according the the Valve Museum. http://www.r-type.org/addtext/add029.htmI am not familiar with the 807 tubes but my impression is that Cossor was a rebrander and not a manufacturer.
Did they make their own tubes at some point?