Does your Krell FPB have cast outputs? If yes, I highly recommend the Krell KCT.
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In my case, I used Krell pre-amps - KRC & KRC-HR - with Krell power amps - KSA150 then FPB300c for many years. While sound was powerful and dynamic and bass was punchy and solid, I always felt I missed a bit of mid-range and upper bass richness and the sound on bright CDs can get hard & tiring. A friend lent me his Aesthetix Calypso pre-amp and what a revelation! Mid-range was rich and liquid, upper bass richness improved and lower bass, while less punchy, did not lose out significantly. Best of all, treble edge was gone while at the same time, high frequency resolution actually improved. I've never looked back. The rest of my system is Von Schweikert VR4jr speakers and Modwright Sony 9100ES player.