Krell KAV-250p - time for change?

My preamp is a Krell KAV-250p, bought primarily for 2-channel listening but also because it has home theater bypass (HTB) when I switch to my Marantz receiver for movie watching. Other equipment: B&W 801s circa 1980, Oppo Blu-Ray, Bryston 9B-SST five channel. I just inherited the 801s from my recently departed father, replacing a set of PSB Synchrony 1s (which I also love).

Anyway, I am not fond of the Krell for the babyish reason that I don't like the volume control. I wish it had a knob as it is too difficult to dial-in the volume I want with the graduated segments. I also wonder, since it is my first preamp, if I might upgrade. The Parasound Halo P6 caught my eye as it has the HTB and decent feedback from owners/reviewers.

I searched this forum and no one had anything bad to say about the Krell. I just thought I would inquire since it's always been my least favorite piece.