I think you mean ECC40, right? I agree - why not current production?
If you really want NOS russian close to 12au7: The russian 6sn7 equivalents (6H8C) have very close electrical characteristics compared to the 12au7, in an octal socket, of course.
Also, the Russian sub-miniature 6N16B-V is similar, but not very close in characteristics. These tube are reported to sound very good, although I have not heard them.
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Not at all. The 6CC40 was made by Tesla and is electrically identical to the ECC82. I haven't checked the pin-out and heater connections though.
The 6CC41 is the ECC83 equivalent.
The ECC40 is completely different tube starting from its rimlock base. It's not similar at all having gain of 32 due to about 1.5x plate resistance. This was introduced by Philips after WWII and it was replaced in early 60ies by the E80CC. The E80CC is/was a special quality tube with very close specs to the ECC40 using a noval base with the same pin-out of the ECC82/83. It has gold plated pins and 10K hours guarantee if used with specified specs. In reality I have often found that the ECC40 is more linear and pretty much at the same level of the best 6SN7 you can find.....just to say that, in addition to the different gain and plate resistance, the ECC82 is not even remotely close to the ECC40 in terms of linearity.
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Actually I once visited a small company (UK) who designed and hand made there own xenon flashlamps for pumping YAG lasers.Later they branched out into strobes and other flashlamp applications at the time no more than Six staff in a small industrial unit.Had a very very good little buisiness. Now a Major player.Tech used similar to tubes so it can be done.
Indeed. I find the suggestion that they are similar annoying, as it propagates the misunderstanding that "mu is all that matters".