A tube was considered acceptable/new/ passed standards if it tested between the specified minimum and maximum on a tube data sheet or the minimum value specified on the tester (tv7 is minimum is 65%).
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Triple Platinum Matched on Amplitrex AT1000. Amplitrex AT1000 Test Results 90%+ GM = Within NOS Specs 90%+ EM = Within NOS Specs. All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE and NOISE (large tube lots are not tested for noise).
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I test all tubes thoroughly and with great care. I test to the best of my ability, and I report all results honestly. See Photos for test results.
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Here we have for sale is an outstanding NOS RCA JRC-5751 tube. Premium quality Mil Spec tube. Black 14mm plates 3x mica spacers and D-getter. All the best and most sought after features of the earliest produced 5751 tubes.
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One tube,circa 1961, Holland made by Heerlen Amperex . type 12AX7 / ECC83 vacuum tube. (Triode#1 / Triode#2). Hickok TV-7B/U tested. Hickok TV-7B/U is a mutual conductance (Gm) type tube tester.
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One pair of Mullard 12AX7/12AX7A tubes, made for Fleetwood and Knight (Kit). Rates dependent on the country of origin. U.S. origin has no tariff to the States.
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• Mids: Warm and smooth, with a balanced, slightly scooped midrange that gives a vocal or bell-like clarity. Tubes test NOS. • Highs: Clear and crisp, but not overly bright or harsh. In other words, it is a rare tube that will be noisy when used in most circuits.
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Manufacturer: Sylvania. Getter: Top Halo. But this the way of the world now. We are always looking to buy more tubes. Large collections, small collections, it doesn't matter. Looking forward to hearing from you, Dan.
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