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Re: Thanks for the info....

I've heard Atmaspheres and I've heard Hurricanes, but I will let the reviewers make the public pronouncements about their qualities. Trust me, doing so is a no-win situation for a mfr.

Output impedance is a real issue with tube amps, even those with feedback, because the feedback is not always fully operative due to load reactance. The definitive solution is to use a great many output tubes.

Charlie, I pulled the feedback from the EL34 version of my V8 some three years ago. Its got a bigger soundstage and is more vivid in the midrange, but I can't say as I like it any better overall. I am having some luck, believe it or not, with 6550 beam tubes using *local* feedback. This converts the horizontal plate curves to triode-like diagonal curves. These 6550 amps don't use any global feedback. They were used to drive the Avalon Opus at the recent HE2003.

But I have not given up on feedback. I find it a facinating challenge. The reason I think it can work is because it is used throughout the human body. Even the ear uses it. It is what protects the inner ear from overload. The touch of a finger on a piano key is a servo operation through and through. There is even compensation by integration. So I believe feedback can work. It's just difficult.

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