post #256 of 3057
2/23/08 at 10:28am
I've been using these Russian NOS 6Zh1P-EV EF95 compatible driver tubes for about 150 hours now. I'll share what I know about them. All my impressions have been using the Little-Dot MKII tube amplifier:
First, they have a unique design. There are three molded indentations running down the length of the outside diameter of the tubes. This suggests they were "secured" tight in whatever original use they had. This also suggests they are extremely rugged for that same original use. I wouldn't be surprised if they were made for military aircraft use.
Second, they took less than 40 hours to mature. I'm not sure if this is due to their heavy duty construction, or close tolerances (higher quality) internally. My guess would be the higher quality.
Third, they have become my favorite EF95 tubes, for all types of music. They have no noise, excellent control over all frequencies, present an amazing amount of dynamics and a sound stage that is more than pleasing. Using the best sources I have, these tubes really show their stuff, while maintaining some of that "tube" warmth we all expect.
Forth, I would have to say these little wonders are directly competing with the better EF92 tubes. The frequency response is surprisingly flat, highs are extended and clear, and the lows are just fantastic! Plenty of clean punch, while showing the ability to reproduce those bass ranges where bass guitars and synthesizers like to play.
Fifth, the cost is so low for this kind of performance, everyone should get a set before demand raises the prices. I have no idea if these tubes are stock piled, but they are showing up more frequently on eBay. For the MKII, these little gems have become my new standard of performance for EF95 tubes. I hope everyone who has a MKII or MKIII, will acquire a set. They are just too nice to pass on.
Sorry bout that pfillion, that must have been you I was bidding against for those TS-403b's on Yen's site. I'm sure he has more of them. Yep I won the pair. Bit pricey but I've paid more (upscale audio...Kevin charges a lot for Amperex orange label 7308's).
I also picked up a set of Sylvania mil spec 5654's from Yen as well. They were made in 1953. I'll bet these are a surprise.
Damm, curiosity just took my wallet for a ride. Got a quad set on the way!!