Update to the Sylvania 6EW6 tubes
My fresh wind of LD tubes comes in doses, so I have some time to spend with the Sylvania 6EW6 tube, which I quite enjoyed. The tube is burned in now for approximately 24 hours. It got clearer in terms of reproduction and cleaner in terms of noise floor. The background is not as black as military grade tubes but since it got reduced with the burn in process, it is low enough to not bother me. The tube is slightly microphonic.
When compared to the CV4015, the 6EW6 is quite a bit louder and on a similar level to my CV4014 (EF91). Compared to both, the tube is warmer, sounds fatter. Just for clarification, CV4014 and CV4015 are surely more on the analytical side of the sound signature band. The 6EW6 is not overly warm though and quite transparent. Overall, the tube is well balanced in terms of frequencies.
Extended but also tubey smoothness. I very much like the treble. No sign of grain. Generally, I also like the "crunchy" type of treble, which this is not - you start hearing it, you think that you are not missing anything and just flow with it.
Now comes a tube classical phrase: The mids are lush. They are very enjoyable, also because of the addictive but not overly mellow warmth.
Good presence and articulation, goes deep as well.
The stage is smaller than for CV4014 and CV4015 tubes, on which - in comparison - instrument separation is better and more organized. With the 6EW6 everything moves a bit closer together but each instrument gets a more pronounced appearance. The sound is relatively forward, but not "in your face". The CV4015 imaging is better but then it also is the best I had so far.
Summary so far: Warmer than CV4014 and 4015 - no analytical signature, still revealing, very musical, non-fatiguing and well balanced.
Edited by Acapella11 - 3/7/13 at 3:28pm