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Mullard 12AU7 ECC82 Matched Pair - Shield Logo - BVA - Blackburn 1968/69 - NOS

Mullard 12AU7 ECC82 Matched Pair - Shield Logo - BVA - Blackburn 1968/69 - NOS

Regular price $194.50 USD
Regular price Sale price $194.50 USD
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Tube Summary

No other tubes can deliver vocals like the Blackburn 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. 

Sound Characteristics

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."  This is how the experts on describe the sound signature of British-made Mullard tubes. 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 British made Mullard tubes are also known to have an attractive sparkle at the top with rich we know where that "warm British jacket" comes from!

Professional Sound Evaluation

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

NO shorts, leakage or gas. NO noise or microphonics.

Both tubes tested Near NOS (90%+ nominal mutual conductance) and tightly matched 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: 2,500/2,450 (83%/82%)
Tube 2: 2,520/2,500 (84%/83%)

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 tube's ability to amplify sound, so the higher these numbers the stronger. 

Appearance & cosmetic condition

One with the ultra rare yellow print Mullard shield logo and the other with the Philips Miniwatt label, both tubes are in excellent cosmetic condition. Nearly 100% of the paint and lettering are well retained. The Blackburn date codes etched on glass are also perfectly visible on both  tubes: 

Gf2 B8D5 (Gf1 = ECC82 production gen #2, B= Blackburn, 8 = 1968, D = April, 5 = Week 5 of production month)
Gf2 B9H1 (Gf2 = ECC82 production gen #2, B= Blackburn, 9 = 1969, H = August, 1 = Week 1 of production month)


This pair of tubes will be packaged in new white boxes.
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