Here's a rare chance to get a nice lot of that fables holy grail tube, the Tung Sol round plate/black glass 6SN7GT. These are US NAVY, in boxes. Unfortunately, I can't verify any test results on these so I'll offer them cheaper than usual. I've seen people asking $500 and up for a pair! Let's say $100 each, though I'd much prefer to sell as a lot. I have used all of these (in a Cary SLP-05, though now long sold) and can testify to them sounding SUPERB (they really are the best sounding 6SN7 that I ever heard, and I auditioned a lot). But if, for some reason, these give you any trouble you can, of course, send them back for full refund.
Feel free to ask any questions or send any offers and I'll do my best.