Tube in Preamp or Power amp?

Wenn he is using the Amati, I would not recommand for tubes. This speakers I heard many times go wrong. Often with tubes or even SS without power and control.

"Going to the bathroom and coming back to your amp on fire...."
Women spend way to much time in the bathroom:) (Just kidding)

Just starting out with tubed components the preamp is easier to deal with.They do have a highish output impedance so make sure your amp's input impedance is a higher value than the pre's output.IMO tubed components allow the music to become more natural and alive.Good luck in your search!

I doubt you will get a definitive answer to your question, but you do need to maintain system synergy.

For a tube amp, the speaker's impedance curve should not have substantial dips below the nominal impedance.

For a tube preamp, proper impedance matching to the SS amp must be observed.

If you are going to try a tube component, just make sure it will work properly with the rest of your system.