If you get this player. There is no way you should keep the stock tubes in. I still play CDs and this player will be here for a long time. The tubes took it from a 7.5 to a 9. The only CD player I heard that clearly better was the solutions 540 but at its price you can improve your whole system. This player clearly delivers. I'm extremely picky about my gear. Are there better players out here? Yes, but I think the better players are north of 10k in most cases. Finding this used was a steal for me. There is an artist from Spain named Buika. Female vocalist sings in spanish which I can't speak but she sings with so much emotion it's spell binding. The midrange with this Siemens tube is flat out amazing. If the CCA tubes is similar but better. I'm tempted because this sound has me sitting in my sweet spot.