Perfectly balanced and matched pair of vintage Mullard 12AU7/ECC82 audio tubes - Made in Mitcham, Gt. Britain - 1959 - Same date code - Bugle Boy Labeled - Near NOS. No other tubes can deliver vocals like the British made Mullard's, and that's a fact. These ECC82 tubes, especially the early 1960s ones, are extremely hard to find today and are becoming every serious audiophile's darling. The overall tonality of Mullard ECC82 tubes is warm and lively with a very spacious sound stage.
Like a warm British jacket of the finest tweed, these glorious tubes have an attractive sweet warmth in their midrange and lower regions. The top end is silky and pleasant and doesn't get rolled off. They retain a fine sense of "air" at the top, and the upper midrange is smooth and liquid. These tubes reproduce the human voice, especially female voices, with haunting realism.The Mullard tubes are also known to have an attractive sparkle at the top with rich bass... Now we know where that "warm British jacket" comes from! The pair worked wonderfully and sounded terrific in our professional studio setup for monitoring. Input: Cambridge Audio CXC V2 dedicated CD transport + Schiit Audio Bifrost 2 Multibit DAC. Amplification: Woo Audio WA7 Fireflies (3rd gen) Balanced Headphone Amplifier.
Output: Focal Clear MG Pro open-back headphones. Our full tube sound review was written 100% based on the actual listening experience while this pair of tubes were running in the system described above. Professional testing & sound evaluation.Both tubes tested Near NOS (90%+ nominal mutual conductance) on a reliable recently calibrated Mercury 2000 tube tester with the following results mutual conductance both in. UMhos and in percentage of nominal. Tube 1: 2,600/2,790 (87%/93%). Tube 2: 2,780/2,790 (93%/93%). Good tubes start at 2000 and new tubes incl.
NOS/NIB 3,000 - 3,100, and the Mercury 2000's rated mutual conductance (nominal) for new tubes is 3,000. Test result can also be seen in the pictures. In case you wonder what all these numbers mean to your sound experience, it's actually quite straightforward: mutual conductance directly translates to a tube's ability to amplify sound , so the higher these numbers the stronger. Both tubes are in pristine cosmetic condition. Logos and lettering are well retained.The identical Mitcham date codes etched on glass are also perfectly visible on both tubes. K61 R9B (K61 = ECC82, R = Mitcham, 9 = 1959, F = June). This pair of tubes will be packaged in new generic tube boxes with Soundlumia printing.