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Mullard 12AU7 ECC82 Tubes Matched Pair - 10M Series - Blackburn 1962 - Strong

Mullard 12AU7 ECC82 Tubes Matched Pair - 10M Series - Blackburn 1962 - Strong

Regular price $574.00 USD
Regular price Sale price $574.00 USD
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Perfectly balanced and matched pair of vintage Mullard 12AU7/ECC82 audio tubes - Made in Blackburn, Gt. Britain - 1962 - Close date code - 10M Series - Test Strong - Elusively rare

Product Summary

No other tubes can deliver vocals like the British made Mullard's...that's a fact. And no British made Mullard's can deliver vocals like the 10M Series...this is the end game! Born with gold pins (recall Telefunken ECC802S and Siemens E82CC - even the 3-mica version do NOT have gold pins), the 10M Series ECC82 tubes were specifically made for audiophiles by the special production unit at both Blackburn and Mitcham factories. These tubes went through rigorous testing & screening processes according to the highest standards of the industry. Minimum 10K hours of heater life, super rugged industrial build, section-to-section match and near zero noise are just the beginning. The 10M Series was Mullard's official answer to Telefunken's ECC802S and remains one the very top choices for serious audiophiles and sound professional. The only one problem with these tubes is they are elusively rare as they were produced in very limited quantity and only in select years of production. Exclusively presented here by Soundlumia is a perfect matched pair of 10M Series from the 1962 Blackburn production. Welcome to the concert hall of 10M Series!

Sound Characteristics

For those who feel the Mullard ECC82 tubes are less analytical than their German counterparts, the 10M Series proves that the best tube can be both musical and analytical. One can almost say this is a better version of ECC802S because you get the laser precision in detail retrieval of Telefunken tubes and the unmistakable British warmth & vocal intimacy, which is NEVER truly found on Telefunken. Next, the holographic soundstage...another Telefunken "proprietary" feature is being seriously challenged here as well: 10M Series' presents a less curvy sound stage than ECC802S' without compromising the full 3D imaging. You hear everything right here in front you INSTANTLY as if you were sitting in a concert hall and don't have to look for that unexpected harp sound in the corner (recall how many times you had to do this with Telefunken tubes?) Now there's only one last thing needed to treat the Telefunken "thinness and hollowness". How about some expansive and forward midrange? But isn't that what Mullard does the best? It only gets better on the 10M Series: elegant, gentle, smooth and fluid.  

Any sound review on a Mullard tube without discussion of its "British warmth" would be far from complete. So we dedicated a full paragraph to the comparison between the classic Mullard warmth and the 10M Series warmth. Recall how many times you feel the vocals on Mullard's get too warm it feels like heat right in your face? That is gone on 10M Series! The moment you turn on your music, the 10M warmth begins to release slowly (and of course surely) and gently through your ears and reaches your fingertips before you know it...and then it warms your heart. 

10M Series = the ultimate audiophile tube.

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 Tube Testing 

Both tubes tested strong and Strong (85%+ 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: 2,650/2,600 (88%/87%)
Tube 2: 2,600/2,620 (87%/87%)

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

Both tubes are in pristine cosmetic condition. Nearly 100% of the silkscreen is well preserved. The Blackburn date codes etched on glass are also visible on both tubes: 

B2C3 (B = Blackburn, 2 = 1962, C = March, 3 = Week 3 of the production month)
B2I3 (B = Blackburn, 2 = 1962, I = September, 3 = Week 3 of the production month)


This pair of tubes will be packaged in the new white boxes, secured by a handmade paper ribbon (by courtesy of Soundlumia.)

Shipping Policy 
 - US ShippingFlat-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, Mexico, 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(USPS Priority recommended), or we may not be able to fulfill your order using standard shipping due to our concern of undelivered packages or shipping delays in your country. 

 - 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" or "changed your mind."

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. 
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