Telefunken Black Diamond E88CC / 6922

So if I am reading this correctly, they are a select grade of a JJ design? I know next to nothing about tubes, I only bought the Telefunkens for my DAC because I researched 6922 NOS tubes, and they were supposed to be one of the best, but it seems that they may be trading on a famous name (authorized of course) which is not the original design. Is that how it sounds to you Mofi?

"The TELEFUNKEN Black Diamond Series tubes are built in the
JJ Electronic Factory in Eastern Europe based on their
existing models." Then they are tested, cryo'd, burned in, etc. In other words, they are specially treated JJ tubes.

OK, so then we should not consider them to be true Telefunkens in anything but name.

They sound like re-issues, or "new Production" tubes to me. There are also re-issue Mullards and Genelax Gold Lion tubes out there on the market too. I'm guessing that Amperex, Siemens and others will soon follow suit, making money on a famous name.

The 6922 has been back ordered for quite a while?