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I'm using these 1954 NOS 6SN7 tubes in my Woo Audio WA22. What a difference 1954 makes! Wider and deeper soundstage...through headphones! The resolution is much better than the 1964 stock 6SN7s that came with the amp. Super quite tubes and great dynamic range. The thing that really impressed me was depth. Usually, even with the best headphones and amplification, all of the orchestra's instruments seem to be on a straight line between both eardrums. Not so with these tubes. With a well-recorded orchestral piece, the first violinist is right in front of you, left of center, violas and cellos to the right, tympany way in the back on the left. Try this with Charles Dutoit conducting the Chicago Symphony Orchestra in one of the best renditions of Scheherezade on London 410253-2 from the 1984 Decca DDD recording. The performance with these tubes is holographic. I used some good source program material...and a few different sources, and lastly Internet Radio...WGBH1 out of Boston at 192KB/sec-44.1kHz via the Revo Superconnect's TOSLINK output...and the improvement was even obvious with radio. No doubt....I will be buying again from the Tube Museum of NY. Associated equipment: Woo Audio WA22 utilizing these tubes, the Princess Sophia rectifier tube, and matched Tung Sol 7236 tubes. Balanced Straightwire Rhapsody silver cables. Sennheiser HD800s headphones-balanced. Grado 325e headphones-single-ended. NAD M51 DAC Sources: LG Ext. Blu-ray player, Dell 7737 laptop USB output, Logitech Touch media server with Toslink output, Archlinux O/S-ASUS 170ZDeluxe Motherboard Toslink out to NAD D/A utilizing JRiver Media Server, accessing a 5TB hard disc served by the ASUS RT-ac3100 router.Read full review
Verified purchase: Yes
These tubes should be called "The Killer '52's". Right up there with the classic KEN RAD's, maybe better. I have two pair of KEN RADs (42's). The sound they put out are too close in comparison to make a definite call, at least for my ears. If you like deep bass and a sweet midrange, go no further. Whoever picks up a matched pair (essential) of these will not be disappointed!
Verified purchase: Yes
I vote 5 star for this item. Very good combine with tungsol 5998 tube for headphone amp to drive Senh HD650. Even I got a 50-50 chance of work (left channel big noise as like it gains 50Hz multiple AC current). When it works, great sound!!! Seller ship an other replacement. Fast and kindly support.
Verified purchase: Yes
The NOS balanced & matched Sylvania VT-231 is Best described as clean, clear, realistic, and lively. Rich in harmonics with a LIQUID midrange, very high longevity since these tubes were designed for intense military applications and durability worthiness. Absolute highest level in musical details, clarity across the frequency spectrum, able to retain the warmth and sweetness as heard in a LIVE performance. The materials used to make these tubes are rare earth metals which are no-longer available in today’s new-production tube offerings. Very rare to find real never used NOS, supplies dwindling fast as audiophiles stock up on these rare beauties.
Verified purchase: No
I believe the early 50's Sylvania 6ns7 GT tubes are very good. This tube works very well in "my" system also the early 40's RCA grey glass love that tube. These tubes bring the music to me. I'm happy and that's the whole point.
Verified purchase: Yes
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