Perfect matched & balanced pair of vintage Telefunken ECC88/6DJ8 Audio Tubes - Special Edition - Berlin, 1959 - NOS Tubes Summary Manufactured in 1959 for industrial use and stamped with the special blue and green birthmarks on top, these are probably the most colorful Telefunken tubes we have ever seen. But wait until you hear the sonic differences these special marks make: extra Telefunken precision, extra Telefunken clarity, extra Telefunken low noise, extra Telefunken gripping...all the greatest traits of the Crown Jewelry ECC88/6DJ8 tube times two is what you get from this ultra rare pair. Sound Qualities Like any other Telefunken tubes, they are pleasant to listen to, liquid, euphonic, with a slightly warmer midrange, which makes your sound experience smooth and non-fatiguing, and all that happens on a unbelievably realistic holographic sound stage. Sound texture can be felt through infinite levels of details, laying on top of each other, both in depth and in width. Ones quest for superb sound clarity can end right here. Aforementioned in the summary section, these industrial tubes provides ultra precision in signal amplification, which helps bring in haunting realism to the famed Telefunken holographic sound stage - if you mistaken something in the sound for your next door neighbor please dont blame these tubes! 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 both uMhos and percentage relative to nominal for your convenience): Tube 1: 13,200/13,700 (106%/109%)Tube 2: 13,000/13,000 (104%/104%) Good tubes start at 7000 and new tubes (incl. NOS/NIB) 12,500 - 13,000, and the Mercury 2000s 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 mean to your sound experience, its actually quite straightforward: mutual conductance directly translates to a tubes ability to amplify sound, so the higher the numbers the stronger. Appearance & Cosmetic condition Beside the fantastic sound signature, we treasure this pair also because the great condition of inscriptions on the tubes. The Telefunken logo is visible on both tubes and one of them has nearly perfect paint and of course the Berlin date codes on the side: B rc 05 (B = Berlin, rc = Feburary, 1959.) And of course the diamond mark on bottom - the symbol of the best sound one can ever find on ECC88s. Shipping Policy - Ship worldwide! Flat-rate shipping to all states in the US via USPS Ground Advantage (formerly known as USPS First Class Package.) - Same business day handling. 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. - Customers outside the US please pay extra attention: International shipping is through USPS Ground Advantage by default. Its the least expensive option and includes insurance up to $100 but it may take longer than other carriers. If you prefer to use a different carrier or if you want to protect your purchase with additional insurance, which we strongly recommend it for orders over $300, please contact us before you buy so we can get you the correct shipping rates before you make payment. Return Policy - Please READ carefully First of all, returns are acceptable as long as you are reasonable. We set extremely high quality standard for the products we deliver. Tubes we sell are guaranteed to work because we run professional tests and sound evaluation before they are approved for listing AND before we ship them to customers. So the defective item case doesnt exist and please do not bother trying - this type of returns will NOT be accepted without proof that tubes do not work and we will open a dispute with eBay. Sound experience is a very subjective thing, and lets be real its not that easy to run into compatibility issues between amps and tubes (so that one wont fly, either.) Please contact us to work things out before submitting return requests claiming item is defective or item not as described. We would really appreciate your respect to the professional work we have done (sourcing, testing & matching tubes, evaluating tube sound, sharing our sound experience with you, packing and shipping) to make these wonderful vintage tubes available to you at reasonable prices. Secondly, if you are a tube roller looking to game the return system, Number One STOP. We have seen it all and we know what youre up to. No tricks here please. Abusive behaviors will be reported to eBay immediately and negative feedback will be left to your account - thats guaranteed. We have already reported several abusers and eBay has ruled in our favor the dispute cases. We are more determined than ever to continue working with eBay to help rid of these unprofessional, unjustified, unkind, unfair and unacceptable abuses that are detrimental to the eBay marketplace, the vintage tubes market and the audiophile community.

For sale Balanced Telefunken Berlin 1959 ECC83 Long Ribbed Plate Diamond Base Hickok RD Instruments 1575 Tested Each triode measuring 1500 micromhos (94% emission) Where 950 is minimum value

For sale Strong Balanced Telefunken Berlin 1959 ECC83 Long Ribbed Plate Diamond Base Hickok  RD Instruments 1575 Tested  Each triode measuring 2100 micromhos (131% emission)  Where 950 is minimum value In immaculate physical and sonic condition.

For sale Strong Balanced Telefunken Berlin 1959 ECC83 Long Ribbed Plate Diamond Base Hickok  RD Instruments 1575 Tested  Each triode measuring 2100 micromhos (131% emission)  Where 950 is minimum value In immaculate physical and sonic condition.