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Valvo

2x Valvo Hamburg E88CC = 6922 D-getter - 7L1 D9I - Telefunken & Red Label - NOS

2x Valvo Hamburg E88CC = 6922 D-getter - 7L1 D9I - Telefunken & Red Label - NOS

$594.00 USD
$594.00 USD
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Product Summary

As with any German tube, you should expect nothing but the best in sound from these bad boys, and you will not be disappointed. The top five sound qualities shared by German tubes are delivered with perfection by these lovely tubes, and especially on an ultra rare pair with the "G.Abl." label:

1) Holographic sound stage (leading brand: Telefunken) 
2) Non-fatiguing top end extension (leading brand: Siemens) 
3) Natural tone/flat midrange (leading brand:  Valvo Hamburg)
4) Deeply controlled bass  (leading brands: Siemens & Valvo Hamburg)
5) Ultra clarity and layered details (leading brand: Telefunken)

Sound Qualities

Over the years, we have found the bass on Valvo Hamburg even more appealing than on Siemens (allegedly the King of Bass and that's fine) for a very important reason: there's added substance and weight to the lower midrange that makes the bass more pronounced without being overpowering. This special sound characteristic can only be found on Valvo Hamburg tubes. And because of the added substance in sound, the overall tonality of these tubes feels sweet, warm and musical, and the ambient clues sound closer to your ears. One may find Telefunken's midrange thinner compared to Valvo Hamburg as a trade-off of a more enveloping and curvier holographical sound stage...the law of physics applies here as well - the shape of sound can only change in one direction. 

Professional Tube Testing

Both tubes tested NOS (100%+ mutual conductance) on a reliable and regularly calibrated Mercury 2000 tube tester with the following result (mutual conductance both in uMhos and in percentage of nominal):

Tube 1: 14,400/13,200 (131%/120%)
Tube 2: 12,900/11,500 (117%/105%)

Good tubes start at 7,000 and new tubes (incl. NOS/NIB) 11,000 - 11,500, and the Mercury 2000's rated mutual conductance (nominal) for new tubes is 11,000. Test result can also be seen in the pictures. In case you wonder what all these numbers 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 better. 

Appearance and cosmetic condition
 
Both tubes are in excellent cosmetic condition. At leaset 95% of the inscription & lettering are still intact and the identical acid-etched Hamburg date codes are perfectly visible on both tubes.
7L1 D9I (7L1 = E88CC production #1, D = Hamburg, 9 = 1969, I = September) 
Packaging

This pair of tubes will be packaged in NEW reproduction Valvo tube boxes.
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