Thanks,
Them, I need
- Line premp
- two stereo amps.
- phono preamp
This is the best option for my Altec ?..... is an integrated amp ruled out for my altec ?

Considering that I live in a loft of 60 m2.
How many watts (power amp) i need for High (808-8A) ?
" " " " " low (woofers 515-8G) ?

why everyone recommend 2A3 valves for high ?

nor do I understand which is the function of the crossover ?

I am sorry to ask so many questions, but I want to be sure before I buy something.