Ei Yugo 12ax7 Tubes Matched Pairs

These Ei Yugo 12ax7 smooth longplates were produced by Ei in pre-war Yugoslavia using Telefunken parts and equipment which they purchased from that company when it stopped manufacturing. All four tubes have the same codes, the upside down U with the dot in its center verifying production by Ei in Nis, Yugoslavia. They were tested on my B&K 747B Tube Tester, and showed no shorts or leaks. Two of them registered 115/115, comprising an extremely strong matched pair; the other two also matched nicely with very strong ratings of 100/110 and 102/105. Price is for all four.Buyer pays shipping. Signature confirmation required when delivered. Please see my positive feedback, especially for tube sales.