Tubegroover: "The power supply of the amp will dictate whether or not it runs out of gas on busy and dynamic passages of full orchestral music." Are you suggesting that that is the only determinant of an amp's dynamic behavior and ability to reproduce complex passages with accuracy ? In my experience brute force is not the key issue in well designed amps, whether tube or solid state, (although I agree it is an issue) but rather a break-down in tonal accuracy which I find is better dealt with in solid state than in tubes, dollar for dollar.