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2x TESLA ECC803S (CV4004 7025 ~5751), Prototype Series, 100%+/Matched, 122+128.where a new/unused tube should have S/gm = ~1.60 mA/V, good value for transconductance starts at 1.2 mA/V. Selected from a larger lot of NOS tubes.
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Matched Pair. These are burned in and then matched for pairs on an Amplitrex AT-1000. JJ Tesla is a mainstay in the Vacuum Tube industry. Here are the virtues of JJ Tesla ECC83S tubes Try these in your McIntosh, ARC, Dynaco preamp or any device requiring a high quality 12AX7.
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Tube : 1.2mA / 1.2mA. 1.2mA = 100%.
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1 X ECC83 TUBE. GRAY PLATES, SOLID GETTER. 1958 PRODUCTION.
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For sale best military version - ecc83 / ecc803s TESLA 1965y + 1966y. 100% = 1,2 mA.
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2 X ECC83 TUBE. 1960s TESLA PRODUCTION. GRAY PLATES, HALO GETTER, MATCHED PAIR. TESTED IN FUNKE W20 TUBE TESTER MINIMUM GOOD EMISSION = 60% = 0.7mA.
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