Take a look at the Universal 6 or 12SN7 preamp from Mellow Tone Kits. You can buy it assembled if you want. I had the Cary SLP-98 many years ago and replaced it with an Emotive Audio Sira and then the Epifania, which I still own.
I have many nice pairs of NOS 6SN7 tubes and wanted to use them instead of them just sitting in storage so I built this kit. I'm going by memory but I think this preamp sounds better than the Cary. The tube filaments are powered by a SMPS, so you can swap between 6 volt and 12 volt tubes, which means 12SN7 tubes. And in addition, with tube socket convertors you can also use 12AU7 and 6GU7, 6FQ7, and 6CG7 tubes. It's a very musical preamp and fun for tube rolling.