Nice work. I'm working on my TR-20 now. The power supply came up. The +15V, -15V, and 30V are nice and steady, no measurable ripple. But the +-10V reference supply does not. I'm using my cap-wizard to help find bad caps. So far found 3. Is there really any difference between the TR-10 and the TR-20? How did you make your extender cable? I'm thinking I need to make one myself. Did you figure out a way to restore the lettering? It seems to me there are stencil kits available to put new lettering on. When you replaced the power transistors on the reference board had you determined they were bad?