Matching Quad ELS 57's with an amp.
I am a new boy on the block and in need of some advice please. I have a Naim system which includes a NAP 250, Preamp 82 and the Quad 57's. I recently changed my Naim cables N5 for a set of Audioquest Rocket 88's The sound was A 1 but after some minutes playing the music cut out and the amp was very hot. The upshot of it all was that the Rockets have been returned to AQ for replacement connectors and I'm having the 57's serviced now. If I have to change the Naim system what Amp would suit the ELS's. I like a warm open sound with a strong mid and sweet treble. I have been looking at old Quad 909's and the 33/303 combo. I have also cast an envious eye over The Leben 600- Valve amp-- does anyone own one or heard one?
Thanks in anticipation.