Grannyring, Frank has brought to market some very
interesting designs and appararently he has a good
following, you don't see too much of his gear for sale on
the used market very often. But I would have to disagree
with his statement that all parts sound the same as long as
they meet specs. When I owned an Audible Illusions preamp
and had some of the caps in the signal path upgraded to
Mundorf caps, the end result was nothing short of
spectacular, the improvement was dramatic.
As far as warmup times this does vary from one manufacturer
to the other depending on design. For example if you look at
the Odyssey Stratos, many people for the price love it but
the biggest complaint is that this amp takes forever to warm
up and sound its best. No wonder the power switch is located
on the rear of the amp.