preamp should be matched with the source (to get the desired tone) and power amp with the speakers so for me i would say separates. i believe most people would reccomend tubes in the preamp and then solid state for the power amp. i would look for transparent, good dynamics i.e the power output should double down as the impedance drops from 8 to 4 to 2ohm and would also look to avoid negative feedback.
Separates or Integrated? What makes more sense?
If you had $10,000 to spend on amplification, would you put all that money and get a really great and pricey integrated amp like a Pass or Luxman. Or, would you use that 10k to buy a really great preamp and amp combo. Apart from the convenience and space consideration, hypothetically how would you choose to spend that 10k if sound was your main criterion.
J
J