Negative feedback, voltage and output impedance

Bombaywalla,
If setting sais @0, it doesn't mean that the negative feedback is 0.
Without one, I doubt that any full range amp is produced. The differential input stages(usually dual triode connected as such) imply the stage with 0 gain and 100% negative feedback. The output stage may than be a feedback free... again, with some degree of sacrifice to load capabilities. With tube OTLs it's simply impossible.

No rule without exception. "The result is that amplifiers with negative feedback will exhibit an unnatural sheen and/or harshness in the high frequencies", Atmasphere says. But McIntosh, to give but one example, uses a large amount of negative feedback in its amps, and still they sound natural and sweet in the highs.

The difference between Atmasphere and McIntosh is that Atmasphere wants to make its product more marketable spreading a gossip that less feedback is always better.

Zero negative feedback on my amp also sounded the best, hands down. Increasing the feedback seemed to constrict the sound, decrease it's palpable quality.

All,

Thanks for the replies.

If I understand this correctly, if I want to buy a high power (voltage for ESLs) tube amp with low output impedance and low or no negative feedback, then I need to look at OTLs, correct?

Thanks.

Mike