April 24, 2024
Pair Matched Strong Toshiba Japan 7591 Audio Tubes
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is a nice identical pair of Toshiba 7591 tubes. These are marked Toshiba 5H Hi-Fi and Tokyo Shibaura Electric. The tubes both test at 6900mhos on my Triplett 3444 lab tester w 4600 is considered passing. They also have no gas, grid leakage and still test well over 5000mhos when the filament voltage is reduced all the way to 5V - this means they have a lot of life left. A nice pair of tubes, with good markings.
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