try this:
-combi's scart to dvd recorder input scart.
-dvd recorder scart output to a second tv's AV input
play your tape on the combi. On the second tv, select AV input, so you see what is on the the dvd recorder. On the dvd recorder select Av, Line or EXT input until you see the tape signal. press record and away you go!
tip: keep your original tapes, as optical media like dvd-r and cd-r has proven unreliable in the long term whereas many tapes 40 years old still play perfectly. New technology sometimes causes more problems than it solves!