adapting vintage 3-pin connection to something new

I have a c. 1960 telefunken stereo hi fi console system which includes a turntable. There is no line-out connection (just some speaker jacks using a style of connection I've never seen before). The output cable from the phono which connects to the rest of the system is a round connector with three pins. From the searching I have done, this appears to be the three-pin DIN connector (not XLR) that was common in Germany at the time this system was manufactured.

What I want to do is copy some old 78s to my computer using this turntable, but I'm having trouble determining just what adapter I should use. I can't seem to find any female 3-PIN-DIN-to-something-modern adapter (any suggestions for sources?) I did find some 5 PIN DIN adapters (according to the pin-out diagrams, I should be able to just break off the two additional pins to make it work), but I don't know if the modern 5-PIN DIN is physically compatible with that of the 1960s era.

My final, but less preferred, option would be to just build a connector and wire it with a couple rca cables or a stereo jack. Should I do this, do I need to wory about voltage problems? I hope not, since I'd be grabbing the signal before the amplifier, but I've never worked with audio from this era before.

Any suggestions or guidance would be much appreciated!

Thanks,
Ron.