‘Matched’ refers to comparing the gm test results between the lowest to the highest of the identical sections of a set of tubes. ‘Matched’ I consider to be within 10%. Vacuum Tubes. ‘Closely Matched’ I consider to be within about 5%.
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.
Strong RCA Mexico 12AU7A Long Grey Plates Halo Getter Serious Tubes A634
Type: 12AU7A. Getter: Top Halo. The tubes need to get to you in one piece. Plate(s): Long(17mm) Grey Ladder. But this the way of the world now. We are always looking to buy more tubes. Large collections, small collections, it doesn’t matter.
1950s RCA USA 12AU7A ECC82 7030 LONG-PLATE SINGLE-TUBE HOLY-GRAIL “D-GETTER” NOS
12AU7A = ECC82 = 7030. RCA USA 12AU7A. 12AU7A FACTORY SPECIFICATION is 10,5mA/10,5mA for 100% mA. REAL 1950s RCA LONG -PLATE 12AU7A. Since The Einstein Preamplifier uses only one 1 x 12AU7, it’s important to have a mirror-matched triode tube, low-noise balanced & matched like this 12AU7A.
Pair RCA Conn 12AU7 Clear Top Tubes Test 90/90%+ Matched Strong Amplitrex 12au7a
Amplitrex tested at 90/90% plus. Very nice strong pair of clear top rca tubes! Pair matched within 5% of each other.
Pair (2) vintage 1960s Sylvania Baldwin 12AU7A vacuum tubes – TV-7 test as NOS
This listing is for a Pair (2) of vintage 1960s Sylvania Baldwin 12AU7A vacuum tubes. Long grey plates with top halo getters. They are used but the pair you will receive will test above minimum new spec (86/86) on my TV-7. Readings will be provided for each tube in the shipping box (sorry I don’t have time to provide this in advance). Also tested for shorts and gas. And I popped each in an amp and they sound great. As you may know, organ tubes were selected for their low noise floor and Baldwin got some of the best. Guaranteed good. Returns accepted. No boxes. Thanks!
1960 Matched Pair RCA 12AU7A ECC82 ‘Clear Top’ – Tested Strong!
Tubes tested well into the green on my Eico 666 tube tester, please email with any questions or concerns. Thanks for looking!
NEW OLD STOCK PLATINUM MATCHED PAIR MULLARD BLACKBURN 12AU7 ECC82 CODE MATCHED
Up for sale is a premium matched pair of Amperex-labeled Mullard Blackburn 12AU7A / ECC82 vacuum tubes, both carrying matching B3H4 etched Blackburn factory/date codes. These were manufactured by Mullard Blackburn, England, and labeled for Amperex.
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
Pair (2) 1960s Sylvania Baldwin 12AU7A TV-7 Tested as NOS, Platinum Matched
30 Day unconditional guarantee. This listing is for 2 vintage 1960s Sylvania manufactured Baldwin or Conn 12AU7A non-microphonic vacuum tubes. The tubes are used but test better than the TV7 NOS test score of 86,86 (triode 1, triode 2). Platinum Matched, each tube test scores matched within 5 points. Checked for noise and microphonics at V1 in a SE tube amp. Tubes have Long grey plates and Halo getters. Also tested for shorts and gas. Test Scores on each tube box.TV7 NOS test score is (86,86). You will receive 2 tubes and 2 tube boxes for the listed price.