davidross, I haven't heard the EC 2A3, but I have heard the EC Balancing Act with KR PX4s, which produced a mighty clean and juicy sound on LCD-2, but really did not work as well with any other headphone we had on hand to try. I feel quite comfortable in saying that the Stratus with NOS RCA 2A3s, a cryo'd NOS 5U4G and 6BQ7a produces a very comparable, clean, powerful, fully extended, and emotional sound image with every headphone I've tried. My favorite is still the T1.
Allow me to disagree w/ this. I've used the BA w/ multiple samples each of T1's, 880's, LCD2's r.1+r.2, LCD3's, HD800's, HD600/650/700's, HP2's, Hifimen and more. I have never run into this problem you describe. I think you might not be liking the KR PX4s in relation to those phones or the actual signature of the phones in question. Those are very clinical tubes from what I recall. I love Donalds work and think the Stratus is great but no way is it more clean and extended from top to bottom than the BA w/ the stock tubes in the Stratus. Perhaps your proprietary compilation of tubes kicks it up quite a bit which is the only way I could imagine hearing what you claim. I'm pretty sure there's no way the transformers in the Stratus outperform those in the BA and it's high frequency heater either. You should hear more noise from the BA but it's from the source in front or the track mastering, not the amp. That's transparency IME. If you don't want to hear all that stuff, then Eddie current is not the way to go.