Well this can't be evolutionary but only revolutionary development.
Yesterday I was a laymen and today an expert reg. Klyne's 7PX.
Thanks to atmasphere I aproached those switches without any
fear. According to him those are not important and unimportant
things nobody approches with fear. But the first lesson is that
there is no subsitution for our own experimentation.
Becasuse the lowest amplification ''imply'' the lowest distortion
I have chosen the lowest one (36dB) with switches 7 and 9 in
ON position (the front bank) and nr.10 OFF and 4,5,6,7,8 and 9
in ON position on the back side ''bank''. According to the user
manual this setting means the lowest circuit source impedance.
Then I connected my Denon AU-S1 with Klyne as well with
my amp. No hum of any kind not even this ''low noise'' near the
tweeter. Even my Basis Exclusive is no match for this 7PX/
SUT combo. Whoever owns the 7PX should try a SUT.