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The descriptions above are based on comparison between the tubes themselves in many different types of audio gear. Although very subjective, there is an audible difference between a Mullard 6922 tube and a Telefunken - the Mullard a deeper "colored" tube, and the Telefunken more neutral. If the tube you have is indeed a Telefunken, then it makes sence that you would observe the Russian tube to have less highs. Telefunken tubes (as I mentioned earlier) have extended top end.
But there is no tube that is "better". It's all a matter of taste and flavor. If "X" person is singing, what will help capture their voice accurately and put their vocal in the right area of the mix? Perhaps putting an Amperex tube in an NTK or K2 is the thing. Perhaps using a Royer ribbon mic is the thing? Maybe a U87? Maybe a FET U47?
From my experience, changing from a $20 Russian tube to a $50-$150 NOS vintage tube (of any brand) has the ability to turn the K2/NTK into a mic comparable to mics in the $2,000+ range.
The 3D soundstage that I'm talking about is not a stereo "image" thing. It's like the sound you get from old tube pres, and Neves. Just a LARGE sound. Very dynamic and full of texture that is absent in cheaper gear.
If I'm recording, I let the tube warm up for at least an hour. If I'm doing a few sessions I'll leave it on for days at a time. A hot tube will have maximum potentional for electron flow. It may take 40 minutes or more to reach a constant temperature.
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