Analogluvr, thanks for your comment. I too tend to generally prefer amplifiers which don't employ negative feedback, in part because it may be an indication that the intrinsic quality of the design is sufficiently good that it doesn't need to employ it. But on the other hand there are certainly some excellent amplifiers which do use light to moderate amounts of feedback, many ARC amps being examples.
My point regarding the A39, though, is that its exceptionally low harmonic distortion spec is strongly suggestive of the use of LARGE amounts of feedback, with all of its potential downsides, perhaps most notably Transient Intermodulation Distortion (which is not normally specified and for which I believe measurement standards do not exist). And it is also suggestive of the possibility that the quality of the design is such that, as you put it, a Band-Aid is necessary.
On another note: Bombaywalla, your comment is intriguing, and prompts me to ask for whatever elaboration you may deem appropriate to provide :-)
Regards,
-- Al