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Amperex
Amperex PQ 6922 E88CC Preamp Tube - Holland 1968 - Strong NOS
Amperex PQ 6922 E88CC Preamp Tube - Holland 1968 - Strong NOS
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Perfect balanced vintage Amperex 6922 E88CC PQ audio tubes - Holland, 1968 - Strong NOS - Very Rare
Tube Summary
Enjoy the most musical 6922/E88CC tube on Earth - Amperex 6922 PQ (Premium Quality) made in Holland from the 1960s! PQ tubes are among the greatest Amperex tubes ever made and are highly sought after by serious audiophiles. These prestige tubes were made with special filament technique to produce special quietness in sound - something one can only find on Philips SQ (Special Quality) or high-end German E88CC tubes such as Telefunken and Siemens.
Sound Qualities
As a major step-up of the famed early production of Amperex Holland 6922 tubes with gold pins, these tubes combine the best of both worlds: the large sound stage, transparent midrange and liquid & harmonic sound from the classic Holland made 6922, and the laser precision imaging and superb smoothness in the top end from the PQ series. We have recommended PQ tubes to so many satisfied customers who use them in their phono setup that we have given them a nick name "sound purifier" - the sound that comes from these tubes has absolutely no edginess, glassiness or harshness, and you hear nothing but the soul of your music and all of it. These are the best tubes to to put in the phono stage to "purify" your sound.
Appearance & Cosmetic condition
This tube is so rare because nearly 100% of the paint is intact, and the Heerlen date code is perfectly visible:
GAC delta 8F1 (GAC = control code for the 1960s, delta = Heerlen, Holland, 8 = 1968, F = June, 1 = the 1st week of the month)
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 and percentage of nominal):
14,100/13,600 (113%/111%)
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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