MATCHED Octet/8, 6N1P-EB = 6N1P-EV = 6H1N-EB, NOS, Russian Preamp Vacuum Tubes

Matched Octet, 6N1P-EB = 6H1N-EB = 6N1P-EV NOS, Preamplifier Russian Vacuum Tubes, from the Novosibirsk Vacuum Tube Factory, it's an large collective factory in Russia, they're ruggedized, long life, Russian military grade versions, of the standard 6N1P vacuum tube, offering excellent & superior durability, lower microphonics, and better audio sound quality, than the standard 6N1P vacuum tubes, these 6N1P-EB vacuum tubes, are superior alternatives, to the standard Chinese 6N1, and similar tubes, like the ECC85 or 6AQ8, the 6N1P-EB are highly regarded for there warm & sweet sound, and improved low-frequency response, when compared to the standard 6N1P, I purchased an surplus of these 6N1P-EB/6H1N-EB preamplifier vacuum tubes, awhile ago, from VivaTubes.com, as long term backups, but I now realize that, I purchased way too much back then, lol, so now I'm selling them, at an very affordable, low clearance price.