1 X 12AX7A / ECC83 TUBE. 1980s PRODUCTION. GREY PLATES, HALO GETTER, COPPER RODS.
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Triple Platinum Matched on Amplitrex AT1000. Amplitrex AT1000 Test Results 95%+ 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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Matched pair. These are triode section by TAD matched for Gm and then matched for pairs on an Amplitrex AT-1000. Here are the virtues of JJ ECC83 MG tubes - This tube will be a classic JJ is a mainstay in the Vacuum Tube industry.
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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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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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ECC83 12AX7 Clear Top Valve Tube. RCA, Made in USA. Fully Tested on AVO VCM 163. Long Grey Plates, Side Rectangle Getter.
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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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Triple Platinum Matched on Amplitrex AT1000. Amplitrex AT1000 Test Results 95%+ 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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