These are grey short plates with top halo getters. Using my tester where any reading above -50- is considered GOOD, this scored a very strong readings of 70/70 – 69/69 – 66/66 – 69/69 with no shorts and are ready to use for your next audio project(s).
Item Tag: 12AU7A
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Ei Yugoslavia 12AU7 ECC82 Vacuum Tube Long Smooth Gray Plate NOS TV-7 Tested
Construction: long smooth gray plate round getter. The minimum is equal to 65% of the life of the tube. Glass: clear. Tested at: 112/110. Tested for shorts and gas. Date code: unreadable.
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JAN CWL-12AU7 Westinghouse 337 1959 Long Black Plate D-Getter Low Noise Tested
Test Results: Mu/Gain: 16.2 / 16.7 Transconductance: 1.59 / 1.50 mA/V Noise: -84.8 / -85.4 dB Microphonics: Low microphonics — the tap is audible when the tube is tapped, but it dies out quickly with no ringing or excessive feedback
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12AU7A Vacuum Tubes Sylvania Unknown Brand Tested Good on Jackson 648 S
Tested Good on Jackson 648 S. They have tested good on a Jackson 648 S Tube Tester. These are all used vacuum tubes. I do have multiples of this type of tube. You will receive one tube similar to what is pictured.