Just a thought, but before investing in a new amp it might be worthwhile to try changing the connections between the Ref3 and the Krell amp from unbalanced to balanced or vice versa.
Also, I would be hesitant to conclude that the "missing something" is being caused by the amp unless there are grounds for confidence in the condition of the tubes in the Ref3.
Good luck. Regards,
-- Al
Also, I would be hesitant to conclude that the "missing something" is being caused by the amp unless there are grounds for confidence in the condition of the tubes in the Ref3.
Good luck. Regards,
-- Al