@ calvinj, 5 months!, I run my player 10 to 12 hours a day while I was gone working, I stacked 450 hours in less than 90 days!, I was breaking in the unit with music only, I wanted to know what the player sounded like, so I could go from there with my next move, I always turned the system off at night, that way every thing settled in properly and I did not have to hear it all the time, what year tubes did conus send you?, cheers, Ayon Brothers.