I've not listened to 601, but I have used Canary pre and power amp for more than 10 years. In a nutshell, they have the tube sound character but not overly warmth. Good transient and extensions with wonderful soundstage and spatial separation. Johnson Wu had written review on the new 906 pre. Google Canary 906 preamp. It is not your cup of tea if you like old tube sound. Their 300B tube power amp is the cream of the crop. HP from TAS gave pretty decent reviews on their Ref 300B (branded as WE94???). I understand Charles from Western Electric has asked Canary to manufacture 300B amp, but its products are not out in the market yet.
