April 24, 2024
2 USA Tung-Sol 5U4GB rectifier tube USA3 test new 100+
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2 vintage USA Tung-Sol 5U4GB "USA3" audio rectifier tubes, tested new 100+ 2 Tung-Sol 5U4GB USA audio rectifier tube, construction design of U.S.A.3 code and black plates.Quality tubes, not NOS but test as new. Test scores: Tube "322NS3": Plate #1 = 125, Plate #2 = 125. Tube "322MK3": Plate #1 = 118, Plate #2 = 118. strong LIFE TEST Test scores from my professionally calibrated Jackson 648A dynamic plate conductance tube tester, and without shorts or leakage. (Scores of 70+ are good, 100 range is new). The Jackson tube tester uses a 225vac supply voltage on the plates, which is a much higher voltage test -- and much closer to a real circuit -- than most other tube testers (most other tube testers have a rectifier test voltage of only 30-50 vac). [INV1]
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