My feeling is that you're expecting a lot from a 50 watt per channel tube amp (good-sounding triode mode), when asking it to drive not-so-efficient speakers with small (under 6-inch) woofers. Unless you're playing this system in an 8 x 10 foot room your amp will be woefully clipping and your speakers just won't move enough air (no matter what) to give you the kind of sound you're describing.
So if you want bigger, more dynamic sound, why not get a more powerful amp or bigger, more efficient speakers, or both? Or maybe add a more powerful amp and a decent quality subwoofer, or two... There may be more than one way to skin the proverbial cat.
Certainly what you're looking for is possible, but not with your current amp and speakers in your particular room (which you apparently forgot to describe). I highly doubt that your problem is related to your using CD as the source.
So if you want bigger, more dynamic sound, why not get a more powerful amp or bigger, more efficient speakers, or both? Or maybe add a more powerful amp and a decent quality subwoofer, or two... There may be more than one way to skin the proverbial cat.
Certainly what you're looking for is possible, but not with your current amp and speakers in your particular room (which you apparently forgot to describe). I highly doubt that your problem is related to your using CD as the source.