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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We have for sale a 12AX7A tube. The previous owner was an avid ham radio operator and repaired radios on the side for many years. This is part of his personal collection. This has been tested and tested good.
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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.
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Long Black Plates, Square Getter. RCA, Made in USA. ECC83 12AX7A Valve Tube. Fully Tested on AVO VCM 163.
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Here's a NOS sleeve of Amperex W. Germany 12AX7A/ECC83 tubes. Made in 1982. On my B&K 747 Gm tester where results are read in percent of new Gm value 0-120%, they test as follows: 110-110, 108-108, 102-120, 118-117, 100-100.
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Here we have for sale is a rare Valvo 12AX7 ECC83 Tube. I60 series tube with the 14mm grey plates and angled O-getter. BALANCED triodes. Produced in the Valvo factory Hamburg Germany. Circa: 1960 High quality example of one of the early German made ECC83 tubes and very highly sought after.
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AMPEREX ECC83 12AX7 B O G E Y S . LEGENDARY ' TREBLE CLEF'. BUGLE BOYS. MATCHED SET. Closely Matched Codes: IO4 223 IO4 137. These are the Real Deal . ★ Honesty, Reliability and Integrity are Everything ★.
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