Hi everyone,

I (am trying to) restore a 1950s radio + turntable combo (originally built together in the same cabinet), and I need to reconnect the turntable audio to the radio, but I’m confused about one of the connectors.

The back of the turntable

The radio has a 3-pin phono input:

the output matching the turntable icon on the back (raised up for the sake of the picture, and cleaning)

• left: round hole
• center: flat slot
• right: round hole

as you can see on the pictures, the turntable cable has 3 wires:

https://preview.redd.it/gzl8crwq3y0h1.jpg?width=2510&format=pjpg&auto=webp&s=409e1cc40547329c34238e8d782ed13e34166e84

• 🔴 Red → connected to a (kind of) semi-flat blade connector
• 🔵 Blue → (was) connected to a round pin connector
• 🟡 Yellow → missing/broken connector (just exposed wire)

Here is the situation where i get confused, and would appreciate some help/advices:

• is this flat blade connector normal, or is it likely broken/damaged and originally supposed to be round like the others?
  • (IF normal) Where is that flat connector supposed to go? (center slot maybe?
• What is the typical pinout for this kind of vintage phono input? (signal / ground?)
• Is it safe to connect the turntable directly to the radio like this, or should I adapt/convert the connection first?

side-note:

• I never did anything like that and do not know anything about connectors, but still want to try 😇
• I haven’t powered anything yet (recapping planned)
• I want to keep things as original as possible, but safe
• This is the original matching set

Thanks a lot in advance, I’d love to get this thing working properly again 🙏