My Tubadour 4 took 10 months to settle in. That corresponds to advice I received about the output transformers. They're apparently quite good once they're broken in which takes forever, at least 500 hours I'm told. I got mine the end of October last year and it just this past month settled down nicely up top and boosted the bottom. That's about 500 hours play time for me. I suggest don't toss it just yet after eight weeks.