April 1, 2024
Matched Quad EL37 Tubes Mullard Blackburn 4 el-37 tube
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Matched quad set of EL37 Mullard Blackburn tubes (4 total). All tubes test at a close average of 7500 Micromhos on a calibrated B&K Dyna-Quick 500, with 0 shorts and 0 grid leakage. I've also tested these on a Sencore Mighty Mite tube tester. They all test strong with no leakage, and no shorts on that tester as well. The needle reads just below the 7500 mark on one tube, which I labeled at 7450, another was right at 7500, and two were just above at 7550. These were pulled from a Crown SXA amplifier, which has not been powered on for 30+ years. All tubes have the code R61 with B81 printed underneath; On one tube the date code is light, and the Mullard EL37 logo is wiped off, that tube is marked at 7550 Micromhos. All date codes are pictured. All tubes will be packaged with generous padding, and shipped insured.
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