Pair ecc83 I61 B2H3 on both tubes V1 : 1690/1720 mhos gm V2: 1650/1700 mhos gm
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What you see is what you get. Sold as is.
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Excellent matched pair screened for Motorola made at the Blackburn factory matched dates B2C3 161. Warmth and Smoothness: The Mullard ECC83 is renowned for its rich, warm sound with a smooth, almost musical distortion.
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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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Mullard / ECC83 MULLARD ECC83 - 12AX7 This listing is for 1 double triode preamp tube. It is more or less used but has been tested good. The internal construction is EXTREMELY rare, featuring an early type with a square getter and long plates. This tube was made in 1954 and has the etched code H4 1600 visible on the back. This is ONE OF THE EARLIEST EVER ECC83 TYPE! Shipping via registered airmail with tracking number. Import fees for U.S. buyers are included in the shipping cost under the new tariff regulations. Other methods available upon request. Internal Reference (SKU): 97_1cf63
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Yellow Print, I61 B4C4 Code in the Glass. Short Plate Halo Getter ECC83 12AX7 Valve Tube. Mullard, British Made. Fully Tested on Avo VCM 163.
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I tested it on my Amplitrex AT1000 in both Fixed Bias and Auto Bias modes. It is labeled The Fisher, but made by Mullard. It has the code "641.". It was manufactured in 1957 in Mitcham. The 56% GM on one triode may seem a little concerning.
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2 x Mazda Valve Tube Used Tested V1 1400/1400 mhos gm V2 1450/1450 mhos gm
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