@ melkior,, I will take your advice, I have close to 300 hrs of burn-in time now with the new Ayon 2s, It sounds to me like the unit may need 400 hrs to do the trick,,running the player direct to amp like I do, the player is not running full signal, the tubes do not get as hot, so to radify this, I will be turning the amp off and play the Ayon at full volume-signal to get the tubes as hot as they can get to help the burn-in process,, I will take the time, as you said, to get to know the player, then change out the stock tubes,, let me know what year of the 6h30p-Dr tubes you have?,, Thankyou, always a joy to talk to you!, cheers!