Robert Morein wrote:

IMHO, topologies do make a difference:
1. cold running, precision biased bipoloar
2. high-bias bipolar
3. MOSFET, traditional
4. MOSFET, transnova topology

If I understand you right, then if it is bipolar then it is usable only
to generate heat and not even good at that.

We're both arguing from personal experience,

The Sony FET amps I had in a car some years ago had a nice treble.
Generally however if it is FET I need to have explained why it is worth
listening to now, because when I bothered listening to it last, and that
*is* way many years ago, the FET treble was just a cloud of white noise.
You very claim that metal tweeters are good to show the virtues of FET
amplifiers does however seem to somehow substantiate that not all FET
designs have as clean a treble as some japanese bipolars from the
quality wars late 70-ties and early 80-ties in as much as such
amplifiers (Sansui B55 with input coupling cap replaced and spectrum
display physically removed) are the preferred ones for midrange and
treble into compression drivers in this household and in as much as a
newly acquired Technics amp from the same vintage has become the new
"master of the full range" for the duration of an Audire amps disease.

but I submit that I have the "white crow", ie., that my
personal opinion contains the exception that
breaks your rule.

My observations conform very poorly to your general rule as extracted
from your recent posts, what I happen to have is then some old stuff,
but I am not really convinced that new stuff actually is relevant to
replace it.

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