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Amperex

Amperex 6922 E88CC JAN Military Tubes Matched Pair - USA 1966 - Same code - NOS

Amperex 6922 E88CC JAN Military Tubes Matched Pair - USA 1966 - Same code - NOS

Regular price $264.00 USD
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Perfect matched & balanced pair of vintage Amperex JAN 6922 White Print audio tubes w/ O-getter and gold pins - Made in USA in 1966 - Strong NOS - Very Rare

Product Overview

Built and tested according to military specs of the US Joint-Army-Navy, Amperex JAN 6922 has been one of the most reliable 6922/E88CC tubes 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 military for mission-critical communication devices; its sound signature is fantastic - the Amperex USA 6922 sound at its best.

Sound Qualities

The clarity and sound detail on JAN 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. 

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 Strong NOS (110%+ nominal mutual conductance) on a Mercury 2000 tube tester with the following result (mutual conductance both in uMhos and in percentage of nominal):

Tube 1: 14,200/14,200(114%/114%) 
Tube 2: 15,200/14,800(121%/119%)

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 pair because the pristine condition the two tubes are in - over 95% of the paint is intact, and the identical date code etched on glass is perfectly visible on both tubes:

7L9 *6D (7L9 = change code, * = Amperex New York factory, 6 = 1966, D = April) 
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