12au7 tube?

@lowtubes with your expertise in 12au7 tubes, I wonder if you could help clarify something touched on here and something I’m still a little unsure of.  Regarding vintage Amperex, Mazda and Radiotechnique, generally who made what for who? I guess I could ask some of online sellers of vintage tubes but since you’re here and they’re not a clarification could also be helpful to some of the other participants of this thread.

50”s VALVO.

The OS (used) Mullards I got from Andy Vintage Tube Services are fantastic, and not woolly. If you buy slightly used from Andy you can get great vintage tubes for much less than your budget. Recently I bought a quad of Rays tubes, the EL 34. They are the best new tubes I’ve heard in a long time. Their 12 AU7 might be worth trying too

I've had really good luck with the new-production Apos Ray 12AU7s. They come with a warranty and sound very good compared to the leading NOS 12AU7s I have in my stash...

There are so many variations in NOS Mullard tubes (different factories, different styles, a whole range of dates of production), that it's impossible to generalize about them.  I wasn't impressed with the pair that I got, but that doesn't mean that some other pair might sound fabulous.

That's one positive vote for the Apos Ray.  I'm feeling tempted.