Can you have too many tubes?

Kdbrink, there's no such thing as too many tubes, only getting a good balance/synergy for a musically natural and neutral system.

I don't know the TAD-150 preamp, so I don't know what degree of opportunity you might have for improvement through adding a dedicated phono stage. Clearly, there are some excellent dedicated phono stages available that could improve most systems (e.g., Aesthetix Io Signature, Aesthetix Rhea, Manley Steelhead, etc.). The expenditure you're willing to make will be a big factor here. Hopefully someone familiar with your current preamp will chime in.
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My stereo requires 110 tubes and when my new open reel tape machine arrives, it will be 124 tubes :^).

As Rushton says, it's balance and musicality that matter. Don't worry about how many tubes, just how it sounds.

Albertporter, where did you get your system...Circuit City :-) Seriously, that must be audio heaven on earth! I heard those Dalis at the CES...I would put them in the coveted "state of the art" category...with tubes. I was mesmerized. Heard them the next year, with SS...ugh! I couldn't believe that it was the same speaker.

BTW, could you please list the number of tubes per piece of gear? Just curious....thanks!