Make sure you have speakers of sufficient efficiency! If you really want to get the most out of your amp, the speaker should be sufficiently efficient such that the amp is never pushed past 20-25% of full power. This will allow the distortion of the amp to be very low; the source of their 'inner detail'.
SET amps
What tubes are a good balance of great intimate sound and budget? Any suggestions for amp kits and builders? $1500 budget Or so. Any options?