jadi jpThe best tubes have always been Telefunkens. Mine has all Telefunken 803S. Also agree you should avoid any mods to Jadis equipment. Had one done on the JP-200Jadis jp 80 mc preamp with mmmc phono (newer version) Canuck Audio Mart CA$9,500 Jan 25, 2025 Kleinanzeen AUDIO 121996 VINTAGE 770 JADIS JP80 REFERENCE 1PH3