The tube in this is a ECC82 (12au7) not the 12ax7 it is supposed to have (though it works fine with the 12au7 and is high enough output anyway)
the random tube I got in a batch with two misslabled 12ax7 on eBay years ago. I only bought it cos I fancied trying something else in the walkabout I had. I think one was a dutch Phillips made thing from the 60's and the other was Chinese. Anyway, one sounded not amazing and one was nicer than the stock.
Anyway, this one which sat forgotten in the garage is a July 1953 Berlin made Telefunken. I know nothing about tubes and don't know if that is good or bad - but it is the oldest thing I own apart from the house (1790-1820)