Thanks for the reply. I am also trying to figure out if it is worth the extra bucks (or perhaps my quickly dropping euros) for the CS 300X rather than the CS 300. So are you trying to say that a CS300 with NOS Mullards or even NOS Sylvanias will sound better than a CS300X(S) with stock sovteks?
Any way it's interesting that a guy that has spent as much money and time as you on gear willl stop $300 short and punt on the mullards . That says something really good about the sylvanias. Don't it?