modified jolida 100, mh cd-25, or audio aero prima

I found the Sylvania black plate 3 mica to be the best followed by the GE. I replaced the power cord with one available from venhaus1.com and am using the DIY interconnect from the same website. I also found placing the CDP on a block of styrofoam useful. All of the above changes had an improvement in the sound.

Thats good info Crgolfer, I havent used Sylvania tubes yet, but I have read that many folks like them. Are the Sylvanias 5751s or 12ax7s?

I have been using Vibrapods for isolation and a MIT Zcord power cable. I am thinking of upgrading the PC. Any recommendations?

I have had a pair of EI 12ax7ln's tubes in for a week or so. I really like these tubes.

Muralman, have your EH tubes arrived yet. I am interested in your opinions on these.

I'm running them now, for the first time, Distortion. I don't hear the microphonics that plague nearly all 12AX7 tubes. The mids are very good. There is a trade off between the EH tubes and the Sylvania 5751 black plates (my personal favorite). The EH tubes are gently rolled off. This gives a softer, not unpleasant female voice. The bass is more soft, but forgiveable. Because of the roll off, the EH tube is not as concise or detailed as the Sylvania.

I will give the EH tube high marks, though, because compared to all 12AX7 tubes I have tried (Mullard, Telefunken, Phillips, etc.) the EH is the most enjoyable, and they don't call attention to themselves, their faults being relatively minor.

Now I have switched back to the Sylvanias. The roll off is gone, and the leading edge, so important for transparency, is fully restored. The bass has tightened, as I knew it would.

I am surprised that the 25% less gain of the 5751 isn't pronounced. That might be because of the higher treble energy.

For casual listening, I will keep the Electro Harmonix in the stable. Thanks for the tip, Distortion.

Muralman, its been a pleasure discussing tubes with you and the others in this thread. Thank you, for all the input. I think you hit the nail on the head with the description of the EH tubes. Did you notice any change in imaging or depth with the EHs?

I agree about the gain, the difference is hardly detectable.

I am gonna try out those Sylvania's if I can find some, I will revisit this thread when/if I do. I think Upscaleaudio.com has some.

Thanks again all, and enjoy.