Tube rolled 4 times with NOS McIntosh originals, Telefunken, Amperex, GEs and Mullards trying to tame my C2200 McIntosh Preamp of its shrill upper end. Constantly bought NOS and quickly resold at a loss on A'Gon because everything sounded harsh despite claimed warmth of those tubes and preamp. Was just about to send it in for warranty work when one day while sitting trying to listen I remembered that the C2200 had a treble dial - which I'd forgotten about since none of my equipment has had it in the past 15 years. So, I walk over to the Mac to turn down the treble from neutral and discovered the dial turned all the way up.
Then remembered my 2-year-old grandson had been left in the listening room unsupervised for a while just before it happened. Musta had a lot of fun playing with the cool dials. Turned the treble dial to neutral, everything sounded great. But audioplila nervosa set in again and the tube-rolling bug hit again. But now I am happy. Poorer, Chagrined. But happier. My son will never let me forget it.
Then remembered my 2-year-old grandson had been left in the listening room unsupervised for a while just before it happened. Musta had a lot of fun playing with the cool dials. Turned the treble dial to neutral, everything sounded great. But audioplila nervosa set in again and the tube-rolling bug hit again. But now I am happy. Poorer, Chagrined. But happier. My son will never let me forget it.