I second the Chromecast Audio, for around £20 it's a no brainier, can use Tidal, Spotify, Play Music, TuneIn Radio, Deezer and countless other music sources, just plug it into your CD digital input ( need to buy a cable as it doesn't come supplied with the Digi one ), or via the 3.5 to rca inputs in your amp. Digital will be superior but rca will be fine too see if it will do the trick for you.

I'd resist spending to much as the makers are very good at making your current streaming device obsolete with new models seemingly arriving monthly lol.

I could loan you a Chromecast Audio to try and see if it's for you