Description

Soundlumia's Opinion 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 Master Series...this is the end game! Born with gold pins, these ECC83 tubes were specifically made for audiophiles by the special production unit at both Blackburn and Mitcham factories. They had gone through rigorous testing & screening processes according to the highest standards of the industry at the time of production. Minimum 10K hours of heater life, super rugged industrial build, section-to-section match and near zero noise are just the beginning. The 10M Master Series Mullard's official participant of the ultra high-end ECC83 competition and remains one the very top choices for serious audiophiles and sound professionals. The only problem with these tubes is they are elusively rare as they were produced in very limited quantity and only in select years of production. For those who find Mullard ECC83 tubes are less analytical than their German counterparts, the 10M Master Series proves that the best tube can be both musical and analytical. One can almost say this is a better version of Telefunken ECC83 because you get the laser precision in detail retrieval of Telefunken tubes and the unmistakable British warmth in sound, which is NEVER found on Telefunken. Next, the holographic soundstage...another Telefunken "proprietary" feature is being seriously challenged here: 10M presents a less curvy sound stage than Telefunken ECC83 without compromising the full 3D imaging. You hear everything right here like at a concert hall instantly and don't have to look for the harp sound in the corner (recall how many times you had to do this with Telefunken tubes?) Now there's only one last thing that's need to treat the Telefunken "thinness and hollowness" problem. How about some expansive and forward midrange? But isn't that what Mullard always does the best? It only gets better on the 10M's: elegant, smooth, gentle, subtle and fluid. Any sound review on a Mullard tube without discussion of its "British warmth" is not complete. So we dedicated a full paragraph to the comparison between the classic Mullard warmth and the 10M's 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. 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 Master Series = the ultimate audiophile tube. Professional Tube Testing This set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result: Tube 1: Measured transconductance(GM): 1.31/1.65 mA/V - 82%/103% (100% = 1.60 mA/V) Measured plate current(IA): 0.782/1.172 mA - 65%/98% (100% = 1.2 mA) Tube 2: Measured transconductance(GM): 1.36/1.58 mA/V - 85%/99% (100% = 1.60 mA/V) Measured plate current(IA): 0.94/1.12 mA - 78%/93% (100% = 1.2 mA) Curve trace is also included in the original RoeTest report. Appearance & Cosmetic condition Silkscreen: 98% - 100% (Immaculate) Date codes: Tube 1 - B2D1 (B = Blackburn, 2 = 1962, D = April, 1 = 1st week of the production month) Tube 2 - Fainted Packaging NEW reproduction Mullard tube boxes. Shipping Policy - US Shipping: Flat-rate USPS Ground Advantage (upgradable to flat-rate USPS Priority or FedEx 2nd Day for expedited delivery.) - International Shipping: Flat-rate USPS First Class International (upgradeable to flat-rate UPS Worldwide Expedited or DHL Express for expedited delivery.) Due to logistic issues with destination country's postal service, we are unable to ship to the following countries using USPS First Class: Armenia, Chile, China, India, Latvia, Mauritius, Mexico, Serbia, Slovenia, Tuvalu. If you are a buyer from one of these countries, you must contact us to arrange shipping prior to purchase. - 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 tax/GST/VAT 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.