Perfect matched pair of vintage Mullard 6DJ8(ECC88) audio tubes - Made in Gt. Britain - 1969 - Very Rare. No other tubes can deliver vocals like the Blackburn Mullard tubes, from ECC88 to E88CC to E188CC every variant of these can make your audio system sing like an angel, and that's a fact. These ECC88's are extremely hard to find today and are becoming the darling of every serious audiophile. The overall tonality of Mullard ECC88 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 Mitcham 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! Both tubes tested Strong NOS (110%+ nominal mutual conductance) on a Mercury 2000 tube tester with the following result mutual conductance both in. UMhos and in percentage of nominal. Tube 1: 14,000/13,800(112%/111%).
Tube 2: 15,000/14,000(120%/112%). Good tubes start at 7000 and new tubes incl. NOS/NIB 12,500 - 13,000, and the Mercury 2000's rated mutual conductance (nominal) for new tubes is 12,500.
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 the numbers the stronger.
Although one of the tubes has nearly half of the paint and lettering due to storage, we still treasure this pair because the very close date codes, which are perfectly visible. B9J4 (B = Blackburn, 9 = 1969, J = October, 4 = Week 4 of the production month). B9L3 B = Blackburn, 9 = 1969, L = December.3 = Week 3 of the production month. All of our tubes are guaranteed to arrive in the exact condition as described in our listings. That means there's no possibility of you receiving a "defective item", therefore there is no plausible way for a customer to try returning a tube by reporting it as "defective". This type of return will NOT be accepted without proof that the product is faulty.