@stereo5 apologies for not being clearer.
The amps are Crimson 880. Did I forget to say that the people behind Crimson and Tocaro are not only very nice but also real geniuses?
There is no adjustement necessary whatsoever. I push ON on the Crimson 710 preamp and the 880s turn on in sequence. One after the other. And then only one volume button. That’s it. British hifi at its best. Redux to max. and 50 years of maturing. Yes this system plays against anything at any price and is simple to use. Worth every penny. But lots of pennies…. 😉😉