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In Reply to: RE: Mini review: Psvane Treasure KT88 (original version) posted by Mendel on July 24, 2015 at 06:07:49
Mendel,
Any thoughts on the grey glass version yet?
Also, where did you source them as well as the original versions?
Follow Ups:
Hi Eire51
Have had the grey glass tubes in for a week. They are still not fully broken in I think, but they are sounding very nice indeed. I intend to listen to them for another couple of weeks, then switch in the original black glass and maybe even some EI Kt90s before I come to a definitive opinion. It may take a few months to get the full measure of these but I can say at this point that they seem to do everything the black glass did with a little more extension at both frequency ends. They are very sweet sounding through the mids while still avoiding the Kt88 mid bass bloat that I so despise. No one will ever mistake these for a KT66, but they are very linear sounding for a KT88. Great sounding tubes, the only real negative is that they (almost) cost like good NOS.
Since you asked, both sets of tubes were purchased from Chris at PartsConnexion. He made me an offer on the grey glass I couldn't refuse. I've bought a lot of tubes from Chris and he and his staff have always treated me great and the tubes have always tested top notch and never given me any problems. Thanks Chris!
Mendel,
Thanks for the update. Burning in some KT66's now, but am interested in the KT88's as well.
Enjoy the new tubes.
Just wanted to update this old post.
I have been spending a lot of time recently with KT88/KT90/KT120 tubes in my Rogue Stereo 90 as I can use the extra watts over my prefered KT66/6L6 for my Acoustat Spectras. Recently went through EI KT90, Tung Sol KT120 and the grey glass Pisvanes KT88.
In my amp, the grey glass Pisvanes rule this tube type. They absolutely destroy the KT120s in IMO. I still like the EI KT90s, they are a little more dynamic and ballsy, but the grey glass are so musical its hard to go back. What do I mean by musical? They just have less of an electronic signature compared to the others. I get more into the music. The sense of music radiating from the panels is less, the sense of the musical venue, of musicians playing real instruments in space is increased.
I only have a few hundred hours on them so far so cannot comment on longevity. The bias has been rock steady so far and they still test strong. Very strong. Better than any other new production tubes I have tried on my Stark 2122 for GM, even stronger than my EI KT90s. Given the reports of highly variable quality tubes being exported out of China (you know, that grade A, grade B BS) I obviously got a good quad (two quads actually, I doubled down on these tubes, I like them that much, and the second quad measures as good as the first).
The only negative is the cost, which is high. But so is the performance. If you do decide to try them, go with a dealer that does good testing to insure you get good ones. Highly recommended!
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