[morzh]

I believe that the mill spec tested ones have a pentagon shaped logo on the glass that says "CCCP" inside,

Arran,
No, the Pentagon with СССР and some lines inside is the Soviet "Quality Mark", was put on the consumer goods, not military.
The military, such as the tube I wrote about on eBay, have a diamond with some number inside.




Ron,

yes, from Jim McShane. He came recommended through the, I think, Audiokarma, and we wrote to each other, and I liked the guy. The tubes came with original packaging which is your typical military overkill: you could run an Abrahams tank over it and it would survive. Plus the pins have that plastic thing that goes over them so they do not get bent.....UK military were sure particular about their tubes.