Have you considered having your Krell rebuilt. I just had that done in November and for a whole lot less than the cost of a new amp, I had Krell rebuild my 30+ year of KSA-80B. Its just marvelous. So musical. They put new caps in in and a few other parts, adjusted the bias and tuned it up. It have never been serviced before. And with Krell, two things you can count on, they will drive low impedances (mine is one ohm) and they early ones do sound nice. If you have had yours 10 years, they probably sounded good to you, but could use some new HQ components.
Bailyhill