Recommended integrated amplifier for upgrade

+1 for the Coda CSiB Integrated.  I have had mine for 2 months now driving Thiel CS 2.4s which present with a wicked impedance curve (around 2.8 ohms at 600 hz), and the Coda handles it with ease.  I have the v1, 150 watts per channel into 8 ohms with first 18 watts in class A, power doubling down as you halve the impedance. I couldn't be happier.

I have not tried but a Hegel should work great, H190 or H390. Bryston B135 cubed is also great.

SF used to require a lot of power and if that is still the case I would avoid class A amps. Class D may be a great match. The Rogue Sphinx is for example a tube plus class D combo.

Wow, many thanks for all your sharing and thoughts. Understand and heard Audio Research are good match with Sonus Faber, my current Krell was also a good match , that’s 15 years ago and not the new Krell .  
 

I prefer slight warm, musical with wide soundstage, but not bassy.  
 

Thus, I would most likely look for Accuphase E280 like @robelvick suggested or Luxman as @ghdprentice @erik_squires mentioned.  

If Mcintosh sound too solid state “detail”  as mentioned like Krell, i would remove from my wishlist. Detail is good but not for long listening time.
 

I prefer a more relaxing music soundstage unlike 10 years ago as aging lol
 

Hope will get a demo unit for audition with my 88dB 4ohm SF speaker

Appreciate your feedback

McIntosh MA 352 - Hybrid integrated amp 200 W.  I traded in my MA 6900 for it.  Reg $6,500. New model.

@jasonbourne52 i am using Topping D90 AKM 4499 DAC (warmer than ESS 2nd edition D90) from Auralic Aries Mini to Krell via balanced XLR .

I believe Topping PA5 is more suitable for desktop monitor speaker ,  I prefer musical and warm sound.