I had a Classe DR-10 (SS) with an Audible Illusions Pre (tube) for years. When I originally got the AI and used it with a Hafler amp I immediately notice a huge improvement. The Classes made for much more but one thing I noticed was the Classe was VERY warm. Recently I bought a used Rogue 88 Magnum to go all tube. WOW, what a differrence...clarity, detail soundstage... I have been doing tube rolling to NOS Mullards for the KT88s and they bring a lot more balance and some additional clarity ($720 for the 4). I am also fixing up the small signal tubes to Bugle Boys and RCAs.
I agree in general with the comments above but for the CD player. Going digital does all the damamge to the music. I can't imagine that having tubes in the final pre-preamp stage will make much differrence. I have a Nakamichi OMS-7 that STILL beats anything today that I have heard for a CD player and it has to be 15+ years old. Listen to a regular CD on it vs. a SACD on my pricey Denon 5910 and the Nak is a clear winner.
I agree in general with the comments above but for the CD player. Going digital does all the damamge to the music. I can't imagine that having tubes in the final pre-preamp stage will make much differrence. I have a Nakamichi OMS-7 that STILL beats anything today that I have heard for a CD player and it has to be 15+ years old. Listen to a regular CD on it vs. a SACD on my pricey Denon 5910 and the Nak is a clear winner.