1x Mullard ECC83 Valve. This valve has also been tested in amplifier without any noise. Date Code: B7L. Tested by AVO VCM Tester.
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ECC83 12AX7 Valve Tube. Mullard, British Made. Short Grey Plates, Halo Getter. Used, Supplied in White Box.
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ECC83 12AX7 Valve Tube. Mullard, British Made. Fully Tested on AVO VCM 163.
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1x Mullard ECC83 Valve. Long-plate and []-getter. This valve has also been tested in amplifier without any noise. Date Code: B8L. Tested by AVO VCM Tester. NOS specification: Ia = 1.2(mA), gm = 1.6(mA/V).
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Long plate, square getter, Factory code mC1 B5J, which I think confirms it was manufactured at the Blackburn factory in October 1955. Tested on an AVO CT160 before being put into storage some years ago. The two sections tested at 1.5 and 1.3 mA/V respectively, so a good strong result. Incidentally, the test results written on the valve are in black felt pen and will simply wipe off with alcohol.
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12AX7 CV4004. MATCHING DATE CODES 1975.
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Matched Trio (3 tubes). Trio is matched within 10% for both gain and conductance.
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Here we have for sale is an incredibly rare ANOS tested Mullard 10m 12AX7 ECC83 Gold Pin Tube. Probably the most sought after Holy grail 12AX7 ECC83 tube that people are after for their collection. Factory tested and Selected tube chosen to be one of the highest quality 12AX7 ECC83 tubes Mullard was capable of producing.
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