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OTK

OTK Reflektor 6N23P E88CC Tubes Matched Pair - 1972 - SWGP - Colored Tips - NOS

OTK Reflektor 6N23P E88CC Tubes Matched Pair - 1972 - SWGP - Colored Tips - NOS

Regular price $94.00 USD
Regular price Sale price $94.00 USD
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Matched Pair 1972 Vintage OTK Reflektor 6N23P (E88CC) Tubes - SWGP (Single Wire Getter Post) - Colored Tips - Strong NOS - Very rare

Note: If your system requires a single tube instead of a matched pair, please check out our listing of 1971's Reflektor 6N23P Tube here: http://www.ebay.com/itm/266320510316

Tube Overview

6N23P (Russian name: 6H23) tube is equivalent to European E88CC/6922 tubes. Designed to work in amplifiers and pulse generators, they are guaranteed to deliver high durability (at least 5,000 hours life), reliability and mechanical strength. This pair come with the special OTK purple stamp, a proud statement of the highest standard in testing and the privilege of being selected by the Soviet's State Control Bureau (OTK) for export and government use.  These two tubes in particular also have colored tips (red and green), which are a symbol of select tubes for military or medical use. With premium quality in both build and sound, the Reflektor 6N23P's are the top choice among Soviet-made vintage tubes and also a great alternative to the expensive European E88CC's. 

Sound Qualities

Like most of the Reflektor tubes (from both the 1960s and the 1970s), the 1972's have beautiful airy highs and sound very natural. They excel in sound detail and clarity, and overall tonality is warm, rich and relaxed. The sound stage produced by these tubes is spacious and holographic, very similar to the German E88CC's. They are very fast tubes, as in solid state fast and precise, but with tube liquidity and warmth. There is an immediacy to the sound, crisp and tonally dense, never etched or brittle. These are among my go-to tubes for late night movies when I switch my entire sound world to the headphone stack because you can listen to the movie sound on them for hours nonstop and don't feel fatigue at all.

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 in uMhos):

Tube 1: 13,000/14,200 
Tube 2: 13,800/13,700

Good tubes start at 7000 and new tubes (incl. NOS/NIB) 12,500 - 13,000, and the 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 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. Tubes have no short or gas grid leakage. 

Appearance & Cosmetic Condition

Beside the great sound characteristics, we treasure this pair because the pristine condition the two tubes are in - nearly 100% of the paint is intact, and the date codes etched on glass are perfectly visible - well nothing is easier to spot than date codes on Soviet tubes - simply look for the "72" letters on the glass and the Roman numbers before them stand for the months of production.

Shipping Policy 

- US Shipping: Flat-rate($5.50) USPS Ground Advantage for ALL states.

- International Shipping: Flat-rate ($35.00) DHL Express Worldwide for ALL countries.

 - Orders ship within 24 - 48 hours
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