I would echo Daniel's comments. Since ripping all my CDs to the Brennan B2, I started thinking about all the tapes and records I own and how it would be nice to have them all in one place, on the Brennan. But I never did think to record the records directly to the Brennan, mainly because the records are a bit old and even with a new turntable I acquired for this purpose (a mid-range Audio Technica), I knew I'd want to do some "post-processing," as it were, before loading the music to the Brennan.
The turntable does have a USB output so I just ran that to the computer. [If I had a turntable with only regular RCA outputs, I'd connect it to a device I bought for converting tapes to FLAC files, a Behringer U-Phono UFO202 Audiophile USB/Audio Interface with Built-in Phono Preamp (I bought it from Amazon).]
I then record the records into the computer using Audacity, and then apply various effects--noise reduction and click removal--and then split the recordings into tracks (this is not easily done automatically--it's best done manually). Once I split the tracks, it's fairly straightforward to export the audio as FLAC tracks.
Once the files are ready, I copy them to the Brennan just like copying computer files--the Brennan is visible as NAS on my home network, although sometimes it seems easier to just copy the files onto a thumb drive and then load the files from the thumb drive into the Brennan.
This is a fiddly process and involves several steps, but I am thrilled with the results. It's a lot of fun to "discover" one's old LP collection. While sometimes I like to just play the LP on the turntable, having the capacity to set up playlists and just play music all day is incredibly convenient.