One option would be the WiiM Mini. It would let you stream over WiFi from your iPad to the WiiM and use the headphone analog jack on the WiiM Mini to connect to your preamp with a headphone to 3.5" RCA cable. If you have a DAC in your system the WiiM Mini also has SPDIF optical output. $89 on amazon.com
IPad Pro to preamp
I listen 95% vinyl 5% CD but recently signed up with Amazon HD to stream music in my car. I like that you can make playlists and was wanting to know how can I connect my iPad to my preamp to stream without buying a Node or other streamer. And what would the sound quality be. My iPad doesn’t have a headphone Jack so the 3.5 to RCA cable is not an option.