The amp is going to have its own sound, and I really think that is going to shine through no matter what tubes are in there with small variances depending on what brand and variation you use. Might be the differences are more noticeable in a HiFi setting, but I don't think I'e ever popped a fully functional tube into one of my Sunns and thought it sounded bad, though obviously there's some I prefer over others.
That's it right there. Each tube manufacturer has it's own 'design' of a tube, and for a popular one - ECC83/12AX7 as an example - there might be a few different designs and they sound different. But then again, one specific design wind up being called something else entirely.
But they won't sound different. Some might be inherently more microphonic prone and noisier than others by design, but the main problem is that the tube brands (peolple who select the good from the bad) sometimes label the regular good tubes as premium and the faulty ones standard. Everything hit the market and that's the real problem. Many amp owners ask me if I have compared the RI Mullards or Tung Sols to the original. What original? What specific ECC83/12AX7 by Mullard did they copy? Well, it's not a reissue by design, materials or anything else. It's a tube, and it should work as indicated on the data sheet. Hopefully it's not noisy and prone to microphonics and if it is you should return it
So jealous.
My wife is not. She told me that if I she ever saw those tannoy's in our living room, she'd split! I actually got them for free, from a speaker developer I know that used to work as an engineer in a studio that used 4 of these as monitors. And he gave them to me because of the wife factor