I have the same Krell Amp .
I have used the Melos SHA Gold Preamp (Upgraded to the reference) and that worked very well with my Meridian 508.24 CD Player and the Krell KSA-250 Amp.
Alas, the Melos stopped working and I am going to see how much it takes to fix from Melos Restorations.
In the Mean time I saw a deal on a used Plinius Preamp CD Lad MK11 that I went ahead and purchased . As soon as I recieve it I will comment on this Amp/ Preamp combo.
I have used the Melos SHA Gold Preamp (Upgraded to the reference) and that worked very well with my Meridian 508.24 CD Player and the Krell KSA-250 Amp.
Alas, the Melos stopped working and I am going to see how much it takes to fix from Melos Restorations.
In the Mean time I saw a deal on a used Plinius Preamp CD Lad MK11 that I went ahead and purchased . As soon as I recieve it I will comment on this Amp/ Preamp combo.