Hello John
Welcome back to the forum.
You might look at getting a Naim DAC, or even a Naim DAC v1, e.g. on eBay or PFM.
To get the best out of these wonderful dacs you would want to combine them with vintage Naim sources and amps, and perhaps even vintage Naim speakers, such as SBLs.
Naim amps can be serviced by Naim and by Darran at Class A hifi in Sheffield, and will give you decades of great listening.
Naim streamers convert DSD to PCM, as discussed here: DSD, where and why do we use it?
James