True. Some folks notice hissing when turning up volume...it seems like tube rolling fix that.
Are you considering another tube amp? what about a SS?
I'm open-minded at this point. Too many options out there, I guess. After using my phones for awhile, I've re-evaluated and decided to up the ante on how much I'm willing to invest in a headphone amp. Now the ante is at $1k - I'm even considering the Red Wine Isabellina, but I'm not gonna go that high unless I know I can either audition it first or resell it without taking a bath.
I was interested in cryoparts (Lee) Arte Forma, but I decided not to bother him after learning of his family concerns.