I just have to post this as my own response to my initial posting. In my own system, magic just happened. It is called synergy! What did I do: I finally placed a Valhalla XLR between source and preamp. Should have done a long time ago... Now I have Valhalla all the way from source to speaker. What a difference! And what a relief. I have for some time felt something was missing, but not anymore. I guess the Karan amps are very good, but my interest for switcing amps just dropped to almost zero because of what just took place. I don't think I will test other cables or amps for a while, but just listen to my albums!
PS: Thanks to all of you who sent me personal messages and gave me this advice instead of thinking of replacing my already fantastic Rowland 301 amps.
PS: Thanks to all of you who sent me personal messages and gave me this advice instead of thinking of replacing my already fantastic Rowland 301 amps.