I find myself in need of funds for university books, so I must thin out the tube herd. All of these tubes perform excellently using my Sennheiser HD800 and the "Holy Grail" GEC A1834/CV2523 power tube. They were bought with test ratings near or above typical NOS, and matched sections. The 6SN7 are also compatible with the Bottlehead Crack with the appropriate 8-to-9 pin adapter (I can recommend a good one). The E80CC are also compatible with the Crack+Speedball without an adapter. Both types have a distinct sound signature from 12AU7/ECC82 tubes. The tubes marked with an asterisk come with their original box. The rest will be shipped in a generic white box. I will take pictures on request to avoid manipulating the tubes more than necessary. 12AU7/ECC82 *Amperex 12AU7/ECC82 (Made in West Germany, Siemens rebrand, Orange Globe version, code 9-50) - $25 Valvo ECC82 (Herleen, Holland, code Gf9 ΔXXX) - $25 Phillips ECC82 (Herleen, Holland, code Gf8 ΔXXX) - $30 *Tungsram ECC82 (Made in Hungary) - $30 Siemens (Chrome Plate) ECC82 (Made in Germany, highly sought version) - $60 6SN7, 5292 Ken-Rad VT-231 (U.S. Military tube, gray glass) - 45$ Sylvania 6SN7GT (Made in U.S.A., lightning bolt symbol, bottom getter) - $45 Marconi 5692 (CBS rebrand) - $45 Raytheon 6SN7WGT - $50 E80CC Valvo E80CC (Red logo, gold pins) - $60 Philips E80CC ("SQ - Special Quality" print, gold pins) - $60 Either send me a PM with which tube(s) you'd like to purchase, or let me know what sound you're looking for and I'll make you some suggestions. I'm willing to offer a discount for multiple purchases. I will cover the price of shipping in Canada or CONUS.