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Amperex
Amperex USN-CEP 6922 E88CC 6DJ8 ECC88 CCa Preamp Tube O-getter - USA 1965 - NOS
Amperex USN-CEP 6922 E88CC 6DJ8 ECC88 CCa Preamp Tube O-getter - USA 1965 - NOS
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$140.00 USD
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Tube Overview
Built and tested according to military specs of the US Navy, Amperex USN-CEP O-getter has been the most reliable 6922/E88CC tube known to the world: its quality is more than premium, although it doesn't carry the aweing PQ label like its more expensive siblings do; its performance is superb and in fact very few tubes in this price range can claim to be stronger; its low noise should only by judged by the most experienced sound experts because we are talking about the very tube built for and certified by US Navy for mission-critical communication devices; its sound signature is phenomenal (I don't use this word very often to describe tube sound) and many audiophiles consider the "Holy Grail" ('75 Reflektor 6N23P) its only possible upgrade path.
Sound Qualities
The clarity and sound detail on USN-CEP 6922's are second to none. They deliver the same resolution and grip you get from the best German E88CC's but feel less "clinical", for the lack of a better word to describe what Telefunken E88CC's "ultimate clarity" means. These tubes have a clean, incisive presentation, but are also euphonic and musical. Like the HG's they put all the differing and competing attributes together in one excellent package. As a result, there's no one area they are weak in. The sound stage is not only wide but also deep so every listening experience feels like at a live concert. The instrument separation is not done as beautifully anywhere else, as one would expect from tubes this quiet.
Appearance & cosmetic condition
Beside the world-class sound characteristics, we treasure this tube for its pristine condition - nearly 90% of the paint is intact, and the date code etched on glass is perfectly visible: 7L9 *5K (7L9 = change code, * = Amperex New York factory, 5 = 1965, K = November)
Professional Tube Testing
Both tubes tested Strong NOS (110%+ nominal mutual conductance) on a Mercury 2000 tube tester with the following result (mutual conductance in uMhos): 13,000/13,900
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 a tube's ability to amplify sound so the higher the numbers the stronger.
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