Go with the story about the BEL 1001...its the specs. I know, 'specs don't matter, its the sound'. That is what you say when your amp does not have the specs but you like the sound of the system. You are a 'connoisseur of coloration'. You want warm, sweet, laid back, etc., etc.
But, if you want to hear what is on the CD, the good and the bad, then select good sounding CD's, go for the specs.
THD 10k ohm / Damping Factor >20
You CAN find them in tubes, but it probabaly will not be the famous brands. Rogue meets the specs and is affordable. Or solid state, ATI, Jeff Rowlands, Hafler DH 200, or DH 220, Muse 60, and of course the BEL 1001.
But you have to retrain your ears for 'true to the original'. When you can hear it, then your reference becomes your recall of the sound of live instruments. Its a whole different path for audio.