NOS Matsushita Mullard 6267 (ef86 Ef806) Mesh Screen Silver Plate O Getter

Its industrial equivalent is the 6267. NOS is subject to interpretation and there is no specific definition for it either. There are suggestions and opinions. Tube testers do not test for these problems in the manner in which you think, except to the extent that a tube tester with sensitive leakage detection will find far more “noisy” tubes than a tube tester with only “fair” leakage sensitivity, to the extent that the noise is due to this problem.

1 x 6AQ8/ECC85 Matsushita Tube *Very Strong Testing*#7

1 x 6AQ8/ECC85 Matsushita Tube. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. Bogey(100% or New) = 5900/5900 micromhos @ 10/10 mA +/- 10%. I do combine S&H.

Matched Pair 7025 Matsushita Rare Gold Pins Medical Tips Ring Getters rare 12ax7

Dead quiet rich beautiful Mullard Matsushita tone with gold pins musical plates. There is nothing wrong with performing that noise test however. NOS tubes fall within the Gm characteristic range of an average tube, as published in the RCA RECEIVING TUBE MANUAL, which states “Individual tubes, like any manufactured product, may have characteristics that range above or below the values given.