Sylvania 6SN7-GT. Real 3-hole “Bad Boy” tubes, matched pairs, 1952 and 1953 manufacture. Tubes shipped in vintage or white boxes. All have black T-shaped plates. All test NOS and very strong. Some show signs of use (“burn” marks on the top glass). See listing for test results and dates of manufacture. The sonics of each pair were tested in my preamp. These Sylvanias have extended highs and a very clear, realistic midrange. Also very strong bass with lots of slam. Sound stage is wide/deep, detailed and 3 dimensional. Most forum posts list these same qualities.
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Tubes were tested on my Weston 981 gm tester. Measurements are in micromhos. The MINIMUM GOOD reading for a 6SN7 tube on my tester is 840. NOS 6SN7 tubes test 1600 and over. I cannot guarantee that these tubes will test the same on your tester as on mine. If a tube arrives DOA, I will pay return shipping for a refund.Please order by pair number. Pair #1: $175.00 (First photo). Black T, 3-hole plates. Test 1900/1900 and 1800/1800. Both test NOS and very strong. Both show signs of use. One labeled Sylvania (1953, 5th week). One labeled Philco (1953, 12th week). Both have tight bases. Sylvania-labeled tube has a small hairline crack in part of the base that does not affect the sound. Philco tube has a good vintage box with one flap taped. SOLD Pair #2: $170.00. Black T, 3-hole plates. Test 1700/1750 (1952, 52nd week) and 1700/1650 (1952, 26th week). Both test NOS with no signs of use. Both have a tight bases. One has a small hairline crack in part of the base that does not affect the sound. Both have white numbers showing previous readings on the top of the tubes. Both labeled Sylvania. SOLD Pair #3: $160.00. Black T, 3-hole plates. Test 1650/1600 (1952, 18th week) and 1600/1800 (1952, 18th week). Both test NOS. One shows no signs of use, one shows some signs of use. One has white numbers showing previous test readings on the top of the tubes. Both have a tight bases. Both labeled Sylvania. Pair #4: $160.00. Black T, 3-hole plates. Test 1600/1650 (1952, 31st week) and 1600/1600 (1953, 52nd week). Both test NOS. Both shows no signs of use. Both have a tight bases. One has a small hairline crack in part of the base that does not affect the sound. Both labeled Sylvania All questions welcome. Priced by the pair. This price includes Priority Mail shipping in continental US and PayPal fees. I will pack securely and ship promptly.
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