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Mullard 12AX7 ECC83 Matched Pair Red Tip - Blackburn 1962 I61 - Valvo Label -NOS

Mullard 12AX7 ECC83 Matched Pair Red Tip - Blackburn 1962 I61 - Valvo Label -NOS

Regular price $224.50 USD
Regular price Sale price $224.50 USD
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Mullard 12AX7 ECC83 Matched Pair w/ Red Tip - Blackburn 1962 I61 - Valvo Label - NOS

Tube Summary

No other tubes can deliver vocals like the Blackburn Mullard's, and that's a fact. These ECC83's are extremely hard to find today and are becoming every serious audiophile's darling. And this tube, with the Telefunken logo & "Made in Germany" lettering, is even more special - the warmest sound plus the most prestigious label in the tube world!

Sound Qualities

The overall tonality of Mullard ECC83 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!

Appearance & cosmetic condition

Both tubes have nearly 100% of the paint and lettering remaining, and the Blackburn date codes (practically identical) are perfectly visible: 

I61 B2J1 (I61 = ECC83 short plate production gen #1, B = Blackburn, 2 = 1962, J = October, 1 = Week 1 of production month)

I61 B2J2 (I61 = ECC83 short plate production gen #1, B = Blackburn2 = 1962, J = October, 2 = Week 2 of production month)

Professional Tube Testing

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

Both tubes test Strong NOS (110%+ of nominal mutual conductance) on a reliable Mercury 2000 tube tester with the following result (mutual conductance both in uMhos and in percentage of nominal): 

Tube 1: 1,180/1,190(118%/119%)
Tube 2: 1,080/1,250(108%/125%)

Good tubes start at 650 and new tubes (incl. NOS/NIB) 1,000 - 1,050, and the Mercury 2000's rated mutual conductance (nominal) for new tubes is 1,000. 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 a tube's ability to amplify sound, so the higher the numbers the better. 

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. Soundlumia-sponsored 3-day guaranteed worldwide delivery program ($35 flat rate for ALL destinations in the world) via DHL Express is highly recommended to serious and committed buyers. 
 - 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 my 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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