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Tesla E88CC 6922 Audio Tubes Gold Pins Matched Pair - Czechoslovakia 1971 - NOS

Tesla E88CC 6922 Audio Tubes Gold Pins Matched Pair - Czechoslovakia 1971 - NOS

Regular price $144.00 USD
Regular price Sale price $144.00 USD
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Tesla E88CC 6922 Audio Tubes Gold Pins Matched Pair - Czechoslovakia 1971 - NOS

Product Summary

Whether you're looking to try something totally new and exotic or you want to find the best E88CC tube sound at a budget price, these Telsa steel pins made in the original Czechoslovakia factory are absolutely a stunner. They are easily the best bang for your buck E88CC tubes in any price range, and you get the sound qualities close to those of the top end German/Dutch E88CC tubes. 

Sound Qualities 

Many listeners find these tube sound very much like Telefunken E88CC's and that's a true statement. They certainly share the most lovely sonic features distinctively known to the supreme commander: liquid, euphonic, detailed with great sound clarity. The top end is very smooth and airy with no brightness or harshness non whatsoever and reminds one of the magical non-fatiguing extension of highs on Siemens E88CC's. Midrange presentation on these tubes is transparent and expansive, similar to the famed Amperex Holland/Philips mids from Heerlen and feels even more intimate than on Telefunken's. The bass control on these tubes truly sets them apart: deep, clean and accurate without being too punchy. 

Professional Sound Evaluation

The pair 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 these tubes were running in the system described above.

Professional Tube Testing 

Both tubes tested Super Strong NOS (120%+ nominal mutual conductance) and tightly matched on a reliable and recently calibrated Mercury 2000 tube tester with the following result (mutual conductance in uMhos and percentage of nominal):

Tube 1: 17,000/17,500 (136%/140%)
Tube 2: 16,500/16,800 (132%/134%)

Good tubes start around 7000 and new tubes (incl. NOS/NIB) 12,500 - 13,000, and Mercury 2000's 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 would mean to your sound experience, it's actually quite straightforward: mutual conductance directly translates to tube's ability to amplify sound so the higher the numbers the stronger. 

Appearance & cosmetic condition

Beside the world-class sound characteristics, we treasure this quad also because of their excellent condition of inscriptions. The identical Tesla Czechoslovakia date codes are also perfectly visible on all tubes: 

WW (December, 1971)

Tesla tube date codes can be looked up here: 

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, 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. 
 - 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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