I agree with tomcic601 the RM-10 is a great choice and works great with passive preamps. I run mine with W4S STP-SE into Reynaud speakers. Designed by Roger to drive his personal Vandersteen 2C speakers which it did with my 2CE Sigs with ease. The Nuprime badged Job amp is also a really good amp and a bargain. I could hear no difference between it and the Job 225 it was based on. There is one for sale for a good price on US Audiomart now.
https://www.usaudiomart.com/details/649450510-music-reference-rm10mkii/
https://www.usaudiomart.com/details/649450510-music-reference-rm10mkii/