dames4
SS Integrated Amplifier that would sound good with the PSB Synchrony One B
They want an amp that can be very comfortable with 4ohms even 2ohms as I see it.
https://www.stereophile.com/images/archivesart/408PSBfig01.jpg
+1 for the John Curl designed Parasound HALO Integrated, Pass Labs Inter, maybe "some" Class-D that can handle 2ohms.
Not many tubes unless they have a 2ohm tap, I can think of one, the Primaluna Dialogue Premium Integrated Amplifier 2ohm tap is good (green) but the 4 and 8 peaks up in FR. Trouble is by using the 2ohm tap you sacrifice a lot of wattage.
https://www.stereophile.com/images/1214PLDPIfig01.jpg
Cheers George