Here's a pair of NOS EI 12AX7A/ECC83 tubes branded National. On my B&K 747 Gm tester that measures tubes using a 0-120% scale of new tube value, these test 105-110 and 104-99 They were made by EI using the old Telefunken tube fabrication equipment, so the story goes, and are quite similar.  Gray plates.
   Sorry, we don't test plate current so PLEASE, if that is really important to you buy elsewhere.  There are plenty of tube sellers on here that will give you all kinds of numbers and stories (mostly BS) on how wonderful their tubes are.  "Museum quality" gets extra points, too!  Don't forget, the greatest story with the highest price tube will always sound better in your system!  Make sure you read our disclaimer in red just below. 
    Thanks to eBay's current draconian policies regarding returns, and parts changers, "renters", scammers, etc, we will no longer sell most items as working, but rather "officially" as parts, not working. Also thanks to the same policies, we will no longer ship directly to any country other than the US. Any overseas buyers must buy thru the ebay shipping program.
     The purchaser, upon receipt, might not agree as to my assessment of condition, but that's what it was HERE in MY opinion and it's being sold officially for parts or not working. It may or may not work at all when you get it!   NO REFUNDS or RETURNS!  If you don't agree to these terms DON'T BUY IT.