RCA 6sn7 VT-231 tubes, matched pairs, wartime manufacture, military tubes. Smoked grey glass. All test NOS and very strong. One shows signs of use (see descriptions). Tubes without vintage boxes are shipped with plain white boxes. See listing for test results and date codes. The sonics of each pair were play-tested in my preamp. Deep bass, rich midrange, smooth highs, large sound stage. Most forum descriptions match mine.Tubes were tested on my Weston 981 gm tester. Measurements are in micromhos. The MINIMUM GOOD reading for a 6SN7 VT-231 tube on my tester is 840. NOS 6SN7 VT-231 tubes test 1600 and over. All tubes tested for gas, leaks and shorts. 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. SOLD Pair #1: $160.00. Perfect match. Both test NOS 1900/1900. One shows no signs of use and one shows some use. Both JAN CRC-6SN7 VT-231. 1945 MAY/JUNE AND 1945 JULY/AUGUST. Both sound dead quiet in my preamp. Vintage boxes. SOLD Pair #2: $150.00. Matching plates. Test 1850/1850 (NOS, no signs of use) and 1800/1800 (NOS, no signs of use). Both JAN CRC-6SN7 VT-231. 1944 JULY/AUG, 1945 MAY/JUNE. Both sound dead quiet in my preamp. Pair #3: $135.00. Test 1850/1750 (NOS, no signs of use) and 1600/1700 (NOS, no signs of use). One branded RCA U.S.A. VT-231 and one JAN CRC-6SN7 VT-231. 1943 MARCH/APRIL and 1945 JAN/FEB. Both sound dead quiet in my preamp. All questions welcome.
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