Zd542 after the intial warm up of the entire system around 30 minutes, I start to play my turntable and it requires another 10 - 15 minutes before it sounds right. Never had a problem in the past with the turntable requiring more time. it always sounded right immediately. I'm out of town during the week so this weekend I'll be able to put the belts on and properly lube the table, I feel somewhat confident this will solve the problem. All tubes were replaced about 200 hours ago and all tube equipment was checked out, at that time, by Mitch Singerman an excellent tech in my area. I also checked the speed of the turntable and all is right. What do you think?