ditto Sam's & Distortion's comments on the Jolida responding to tube rolling. I've had a have dozen different sets in mine and it wasn't hard to note differences. Yes, some were subtle differences, but others were hard to miss. Best tubes so far were a pair of Raytheon 5751's ..but..alas..one died a couple weeks back :-((. I went out looking for another pair and noticed Raytheon 5751's have gone up a bit in price...if you can find them...ouch. I've had the player for near two years & like the sound very much(listen to traditional jazz, vocals, acoustic..). I don't see it leaving my system anytime soon.