I am interested in people's thoughts on this as well. I also have a Zen (the Select version, which is the same circuit and tubes as Akhilesh's). I also love my amp but I have noticed in my limited listening experience that the higher-powered tube amps (like Akhilesh's kit from S-5 Electonics and Mark Margiotta's Music Reference - both push-pulls - and even the Paramour's) seem to have more authority in the lower frequencies, even on the single driver speakers Akhilesh and I own. I haven't had enough A/B listening to identify what you lose with this (if anything) but it is something I've noticed. Since I want to build an amp sometime, I will probably do a higher-powered version when I do it (probably a kit, but someday I'd like to do one from scratch).Also, from what I read, it sounds like other than the tube you choose that the power transformers are the key upgrades to make the "ultimate" amp. What transformers do people think are the best?
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