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Mullard
Mullard E88CC 6922 Tube Wrinkled Glass - Mitcham 1959 7L0 - Strong NOS
Mullard E88CC 6922 Tube Wrinkled Glass - Mitcham 1959 7L0 - Strong NOS
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Perfect balanced vintage Mullard E88CC 6922 Tube Wrinkled Glass edition - Mitcham 1959 - NOS - Ultra Rare
Product Summary
The classic example of "what you see is what you hear" magic of vintage tubes! The super rare wrinkled glass on these tubes is not just for your eyes but also for your ears - because of the special glass the extension of high frequency is limited, which makes these Mullard tubes extremely sweet sound and non-fatiguing. And yes the "British Made" lettering is a BIG deal not only because it certifies the tube's true Gt. Britain origin but also because it appeared on select batches of Mullard tubes from select years of manufacturing only.
Sound Qualities
"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 experts on audiotubes.com describe the sound signature of Mitcham 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 human voice, especially female voices, with haunting realism. Full disclosure from your peer audiophile: Mitcham E88CC's are my go-to tubes for listening to Maria Callas and Frank Sinatra and I refuse to use other tubes. Mitcham Mullard's are also known to have an attractive sparkle at the top with rich bass...now 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: Liquid Platinum Tube Amplifier by Alex Cavalli
- 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 Tube Testing
Both tubes tested Super Strong NOS (125%+ nominal mutual conductance) on a Mercury 2000 tube tester with the following result (mutual conductance in uMhos and percentage of nominal):
17,000/16,000 (136%/128%)
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 would 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.
Appearance & cosmetic condition
We treasure this tube also because of the pristine condition - nearly 100% of the paint and lettering are well retained. The Mitcham date code painted on glass are visible on both tubes:
7L0 R9F (7L0 = E88CC production gen #0, R = Mitcham, 9 = 1959, F = June)
Shipping Policy
- US Shipping: Flat-rate ($5.50) USPS Ground Advantage for ALL states.
- International Shipping: Flat-rate ($20.00) USPS First Class International for ALL countries.
- International Shipping: Flat-rate ($20.00) USPS First Class International for ALL countries.
- Orders ship within 24 - 48 hours
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