Mullard Master 10M Series 12ax7/ecc83 Vintage Blackburn Maxi Pre-amp Tested
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One of the best 12ax7's ever, Mullard Master 10M Series 1022-448 12ax7/ecc83 dual triode. Silkscreen in good shape. Tested on Maxi-Pre-Amp tester for Gain (mu) 97.4/101.7, Conductance Gm (umho) 1883/1805 and Noise RMS -74db/-77db. Acid etching is faint and my eyes are bad but I can see a B for Blackburn. Free shipping too.
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