This Mullard ECC83 pre-amp tube was made in Blackburn in July 1963. It has 15mm ribbed plates, a halo gettter, straight pins and very clear printing. I don't have performance data, but on test in my amplifier it has the usual Mullard qualities of depth, clarity, headroom and very low noise.
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ECC83 / 12AX7. TESTS 100%.AS GOOD OR BETTER THAN NEW TUBE. 100%. PRICE IS FOR ONE PIECE. ( 1 Tube ).
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This was made in The Netherlands with the date code ◿7L4. A used Mullard ECC83 valve (short 14mm plate) in good working order. ia (mA) - 1.2. Data Book Specification. GM (mA/V) - 2.05. ia (mA) - 1.7.
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ECC83 / 12AX7. These tubes test less than 100% on one or both anodes but are perfectly good and have plenty of life left in them. PRICE IS FOR ONE PIECE. ( 1 Tube ). 75 - 99 %.
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Mullard ECC83 12AX7. Test results This Valve. IA:1.2 GM: 1.6 ± 20%. Book Value Purchasing from.
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MULLARD 12AT7WA NOS UK MADE Valve Tube. In most cases will replace the hard to find and expensive 12AX7/ECC83. Has slightly lower gain which may not even be noticed. Will be AVO tested for balance between halves and matched in pairs or quads.
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• Factory Code: B1H4 – Blackburn factory, August 1961. • Military Spec: CV492. • Tube Type: ECC83 / 12AX7 – dual triode preamp tube.
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Fully tested on a TV7BU. See pics for test and condition details.
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