I just bought back my old PPA v2 with the zebrawood case.
I had been plotting a β22, but realized it wasn't in the budget. So when my old amp popped up locally, I decided to snatch it up.
I always remembered it as a poor match with my Grados, but I'll be damned, it sounds fan-fucking-tastic with my HF-1s. Detailed, controlled, no harshness and great imaging. It's a nice companion to the Millett.