An absolutely straightforward audio power amp in a simple box would match well with a Caiman or 7520. Those who have already abandoned analogue sources would need nothing else. I guess next to the power supply components and the case is the most expensive bit, but a cheap black brick to hide in some convenient corner would be domestically acceptable.
For me - at least 70w and 100w would be better. I have looked at kits to throw in any old box, but you never know what you are buying.
Brian
In Southampton: Raspberry Pi 4 running PiCorePlayer, Beresford Caiman SEG, Quad 77 Int Amp and CD Player, AVI Neutron 4, Sennheiser HD25 headphones.
In Nicosia: Small Format HTPC, Beresford 7520 ,Quad 405-2, Quart 980s German Tower Loudspeakers.