2SK60 VFET
Sony N VFET OS2
https://www.diyaudio.com/community/threads/diy-sony-vfets-pt-3-got-vfets.381181/
https://diyaudiostore.com/collections/diy-sony-vfet/products/vfetless-round-3-output-stage
https://www.diyaudio.com/community/attachments/diy-sony-vfet-amplifier-os2-pdf.1035400/
Front end card
https://diyaudiostore.com/collections/diy-sony-vfet/products/vfet-front-ends?variant=39433280815177
Theseus PS Filter board