Maybe not the best place to ask, but -- I had a random (simple) DIY phono preamp thought/question | Audio Science Review (ASR) Forum
Groovewatt a DIY Vacuum Tube (Valve) RIAA Phono Preamplifier Project under Repository-circuits -24666- : Next.gr
Riaa-5532 Compact Size Low Noise MM Phono Stage Pre Amplifier For Receivers,Integrated DIY Kit - Motronix
TubeSound - DIY project - MM phono preamp active RIAA with... | Facebook
Stereo RIAA preamplifier
MMCF10 HIFI LP phonograph MM amplifier RIAA Phono preamplifier PCB/DIY Kit/Finished board - Buy cheap in an online store with delivery: price comparison, specifications, photos and customer reviews
You Can DIY! Build an External Phono Preamplifier | audioXpress
DEP3158 RIAA Phono preamp - Share - PCBWay
ZEROZONE (DIY KIT)RIAA MM Phono Turntable Preamplifier / base on DUAL MM LP amp L4 13|Amplifier| - AliExpress