Best sounding amp/preamp for Snell Type E/ll model speakers?

Funny how your list is like a time machine.  I sold Snell during that vintage.  I owned that vintage B&K.  We found most customers underpowered them and tried to get away with 60wpc like a Roberts.  The Hafler 200 would run them fairly well and the Audio Research kicked them hard.  Big AR, like mono block strong.

No need for tubes if you don't want them, but the SS should be current strong with great damping factor.  We found this load a bit tricky at times.  It's a lot of speaker.

If you can get your hands on a Luxman or Accuphase integrated with 100wpc, it might really surprise you how the speaker opens up and the bass foundation tightens up.  Those amps you mentioned, if original, have to be suffering from caps drying up and therefore are not up to spec.  Best of luck finding your best results.

I owned Luxman for my first 20 years of hi-fi then let it go, I know that sweet sound you mention. My Adcom is in great shape. I can try it with the Apt Holman preamp. I sold my Hafler DH 200 last year (mistake). Thanks for the suggestions. There will be another Schitt product in my system at some point, hope it is the Freya. Happy Holidays!

if you're liking your Cambridge, maybe just a step up the the Azur 851A Integrated might do it for you...I have one and it is quite good, more powerful and better sounding than the model you have...