You Can DIY! X-Altra MC-MM RIAA EQ Preamp - Part 1 | audioXpress
What are some good DIY phono tube preamp kits on the market? - Quora
Amazon.com: SUCA-AUDIO Phono Preamp for Turntable MM Phonograph Vacuum Tube Preamplifier with Gain Gear Mini Hi-Fi Stereo for Home Audio with DC 12V Power Supply : Everything Else