Tubes Summary 

The "Super Mullard" is here!  E88CC/01 (a.k.a CV2493) - fully equivalent to E88CC/6922 but a HUGE step-up in both sound quality and build. Most of these tubes were factory screened for tight internal matching and low noise, and Mullard's E88CC/01 type has even more factory testing. Manufactured in very limited quantity (simply because the selection standard was too high for mass produced tubes to meet) and today they are being hunted to near extinction by audiophiles, tube enthusiasts and sound professionals. 

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 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 human voice, especially female voices, with haunting realism. Listening to Maria Callas and Frank Sinatra on British-made Mullard tubes should be one of those musical experiences that one just has to go through at least once in his lifetime. These 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!

Now all those great traits of Mullard tubes you have heard about or have experienced already multiplied by three and that is what you should expect to hear from this pair of E88CC/01's.

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 NOS (100%+ nominal mutual conductance) on a Mercury 2000 tube tester with the following result (mutual conductance in uMhos and in percentage of nominal):

Tube 1 (Left):   15,100/15,150 (120%/121%)
Tube 2 (Right): 14,100/14,000 (113%/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 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 pair also because of the great cosmetic condition of both tubes (clear inscription and clear date codes), which is amazing given the tubes' age. The identical Blackburn date code etched on glass is perfectly visible on both tubes:

B7K5 (B = Blackburn, 7 = 1967, K = November, 5 = 5th week of the month)
B7D2 (B = Blackburn, 7 = 1967, D = April, 2 = 2nd week of the month) 


Shipping Policy 
 - US Shipping: Flat-rate USPS Ground Advantage
 
 - International Shipping: (Please read carefully) USPS First Class International is used for all countries EXCEPT: Armenia, Chile, China, India, Latvia, Mauritius, Serbia, Slovenia, Tuvalu, and Vietnam. If you prefer to use a different carrier or shipping service, please contact us first so we can establish shipping rates before you make payment. If you are a buyer in one of the excluded countries, you must contact us prior to purchase to arrange shipping. Soundlumia-sponsored 3-day guaranteed worldwide delivery program ($35 flat rate for ALL destinations in the world) via DHL Express is highly recommended. 
 - Same day shipping: Orders placed by 2:00PM US Pacific Time on weekdays are posted on the same day, otherwise the next business day. 
 - Combined shipping available - request invoice for total before making payment or receive shipping credit after order ships. 

Return Policy - Please READ carefully

Returns are acceptable if we made a mistake by delivering you wrong or defective products. Tubes we sell are guaranteed to work because we run professional tests and sound evaluation TWICE: before they are approved for listing AND before we ship them to customers. So the "defective item" case doesn't exist and please do not bother trying - this type of returns will NOT be accepted without proof that tubes are faulty and we will open disputes with eBay. Sound experience is very subjective and we do NOT accept returns because you do not like the tube's sound signature or because you changed your mind about your purchase. Please contact us to work things out before submitting return requests claiming "item is defective" or "item not as described" or "just didn't like it."

Tube rollers abusing the return system will be reported to eBay immediately and negative feedback will be left to your account - that's guaranteed. We have already opened several dispute cases to report abusive buyers and eBay has always ruled in our favor. International buyers who request return or refund claiming your country's import duties or sales taxes/VAT/GST are too high will be reported to eBay immediately for dishonesty and will be permanently blacklisted from purchasing from Soundlumia. We are committed to working closely with eBay to help rid the marketplace of dishonest, unjust, unreasonable, abusive buyers that are detrimental to the vintage tubes market and the audiophile community.