[Reece]

These things are pretty simple and don't have many components, maybe only two or three fixed caps and a grid leak. I'd be concerned about the green on those coils: were they supposed to be green or is that copper corrosion?

Edit: The schematics for early TRF's are all about the same. Things to check first with your ohmmeter are RF coil and audio transformer continuity, any loose or corroded connections. Sometimes only certain tubes are on the rheostat and the others run full on. I see from other pictures on the web that the coils were originally colored green so maybe only of cosmetic concern.