Raduschka
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Achtung achtung all of you, I have received in the mail my 2 pairs of Duende Criatura tube rings. Yes, in my setup, and I do not see why it would be particularly prone to vibrations of any kind, they make a huge difference. And one desirable difference that is. I had time to relisten to a murky sounding cd I tried to listen to yesterday. With the rings in place on the 12at7 and the 6v6 I realized that there was nothing wrong with the recording (Sephardic Romances on Naxos). Timbre, soundstage, they turned out to be absolutely alright, whereas yesterday the voices sounded nasial, the strings had a weird ring to them and it was impossible to tell where everything was placed. Another visible difference, I can now turn up the volume and the sound remains palpably clean. Not inexpensive at 100$ for 2 pairs, but very interesting per se, apparently sturdy and indestructible, backed up by 15 years of existence. In my experience they live up to their official claims of cleaning up the soundstage and tightening the bottom end. I haven't yet tried to listen with only 1 pair in place, some say that there is a danger of overdamping the tubes and thus making the amp sound less musical. The mechanics of that elude me and I do not like to believe in things that I don't understand, but I will keep you posted if my experience confirms any of that.
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