I tried Krell KSA 150 with different tubes preamps. I got the best result with Joule Electra preamp. I tried several middle level Audio Research tube preamps. Never liked the result. Joule Electra over-performed the by a considerable margin.
Finally decided to try Krell own KBL. A very obvious winner over all tube preamps. While missing some sweet spots on Joule Electric, the KBL brought my system to a new level especially in imaging area.
Finally decided to try Krell own KBL. A very obvious winner over all tube preamps. While missing some sweet spots on Joule Electric, the KBL brought my system to a new level especially in imaging area.