Halcro I am somewhat confused myself. The tubes make the CD player sound like it never has before. (always wayyyyy below the level of the LP12) On the other side the improvement was not as stark with the Lp12 hooked up to tubes. This could be as little as a poor vintage phono stage. If you would have asked me before this I just assumed vinyl was the only way to go. Almost got rid of the CD player as it was getting so little use. Mostly for my wife really as I never listened to it. I am to the point of wondering if I will keep the Lp12. That's why I say I was confused as well. SS causes an ever increasing investment in the LP12 and I was somewhat frustrated with being somewhat stuck in the past. (vinyl I mean) Halcro I think everyone would agree if you can get digital as good as vinyl sound than vinyl is a big question mark. CD's do not wear out like lp's etc. I know a lot of it has to do with even and odd harmonic distortion. In my opinion digital with (my SS) just gives wayyyy too much odd harmonic distortion.
Which takes me back to Steen's camp. A cheap (my CD player was $3 or $4k new) but only worth $600 (or so) now coupled with a vintage tube amp (again for chump change) with vintage speakers and Duelund crossover blows away a my many, many times more expensive vinyl SS system. Steen says 50% speakers 50% of that crossover and 50% in the rest of the system.
My x-101-d is I think the same as the 500c. Stereophile write this review and I know they love everything except the Fisher does not advertise. They do say the phono stage not all that great.
http://www.stereophile.com/historical/605fisher/