Valvo ECC83 12AX7 Short Plates Matched Quad - Heerlen, NL '70 - Same Code

Description: Soundlumia's OpinionThe "textbook Heerlen sound" has been referenced in several Soundlumia ECC83/12AX7 listings, and many tube enthusiasts asked what all that means. So here is the answer: the late 1950s and very early 1960s tone, the beginning of over a decade's excellence in sound, the classic tonal template for all the great (and greater) Amperex/Philips/Valvo/Miniwatt tubes to be made in the years to come, the timeless Philips radio tone that many of us grew up listening to. The most distinctive sound feature of the Heerlen ECC83's is the transparent, natural and expansive midrange presentation, with a slight touch of warmth that illuminates your music. Every piece of music you play through these tubes sounds like from a vinyl record, whether your sound source is phono or not. The sound stage is spacious, deep and structured. Bass is incredibly deep but well controlled and feels as accurate as on the high end German ECC83's (Siemens, Telefunken, Valvo etc.) We would recommend these as an excellent choice if you are seeking the high end ECC83 tubes that can deliver the legendary Philips house sound flawlessly. Professional Tube TestingThis set was tested and certified by RoeTest V11 Professional Tube Testing System with the following result: Tube 1: Measured transconductance(GM): 1.65/1.66 mA/V - 103%/104% (100% = 1.6 mA/V)Measured plate current(IA): 1.405/1.367 mA - 117%/114% (100% = 1.2 mA) Tube 2: Measured transconductance(GM): 1.63/1.59 mA/V - 102%/99% (100% = 1.6 mA/V)Measured plate current(IA): 1.18/1.21 mA - 98%/101% (100% = 1.2 mA) Tube 3: Measured transconductance(GM): 1.7/1.6 mA/V - 106%/100% (100% = 1.6 mA/V)Measured plate current(IA): 1.24/1.232 mA - 103%/103% (100% = 1.2 mA) Tube 4: Measured transconductance(GM): 1.63/1.61 mA/V - 102%/101% (100% = 1.6 mA/V)Measured plate current(IA): 1.337/1.255 mA - 111%/105% (100% = 1.2 mA) NO shorts, leakage or gas. NO noise or microphonics. Curve trace is also included in the original RoeTest report. Appearance & Cosmetic condition This pair stands out aesthetically among the vintage tubes. At least 90% of the silkscreen is well preserved and the acid-etched Heerlen date codes are perfectly visible on both tubes: I65 ⊿0C2 (I65 = ECC83 short plates production gen #5, 𝛥 = Heerlen, Holland, 0 = 1970, C = March, 2 = Week 2 of production month) PackagingNEW white 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.

Price: 337 USD

Location: Torrance, California

End Time: 2024-11-02T06:29:33.000Z

Shipping Cost: 5.5 USD