In article , Trevor Wilson
wrote:

--- **I'll make it easy for you. Locate an old Phase Linear 400(b) and
an early Perreaux amp.

Your definition of "easy" seems to differ from mine. I do have new
neighbours moving in today though. Maybe they'll have the above amps to
loan me. :-)

Set up a DBT between the two and ask the listeners what differences they
feel they can hear (if any). Let me know what results you find. Both
amps are plentiful and cheap, so the test should be an easy one. Both
amps use ****-loads of global NFB, minimal bias current and primitive
topology so the only major differences are related to the output devices
used.

My problem here is that in the past I *have* repeately compared amps with
different types of op devices. And heard no differences due to that when
the amps were used within their drive limits and had much the same
frequency response, etc. i.e. were sensible designs.

In addition all the properly controlled blind comparisons I've seen
published results from that could be analysed return the same result.

So if your tests show otherwise it would be important to have all the
details published for examination and consideration.

Slainte,

Jim

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