NOS NIB Gain Matched Quad (4) Philips Amperex France ECC40 Vacuum Tubes

Testing: We have multiples of these in stock and therefore are not listing the test results here. All of these have been tested and or matched by/for Gm and Gain on a Maxi-Matcher Preamp tester. 

** Please note, many tubes will test NOS but will actually have a few hours of use on them. A truly NOS tube will have excellent getter flashing condition, no dirt/grime, usually in the original box, and no filament deposits. If a tube is listed  as "tests NOS" but is listed as "not True NOS" please expect the tube to have a small amount of use * 

All tubes have been tested using only the best tube testers. We have a large fleet of tube testers, and every single one of them has been calibrated within the last year by industry experts. We mainly use the Hickok TV-7D/U, but occasionally we may use a Hickok 539, 533A, or 600A.