Nice radio !
I never saw any english language user manual for this one and I don't even have the danish one.
I have a couple of backsides from scrapped sets but none for this model.
I am pretty sure that I have this model in my collection though but it may
be out of easy reach, packed in a storage box among hundreds of other boxes.
I will try to find it and see if I can take a photo of the backside.
The 3-pin plug for the turntable will be a bit hard to find.
I take it that you are looking for the plug that goes on the turntable signal cable and not the one mounted on the radio chassis (which I may be able to locate).
I have a B&O turntable for sale though with the correct plug mounted.
The deck is the type 608VF (with the old counterweight and built-in RIAA preamp). Interested, drop me a PM.
While you are in there, do yourself and the radio a favour and
replace the 6 blue axial electrolytic capacitors located at
the output stage board (the vertical board holding the 4
output valves which seemed to be missing when the photo was taken).
Mounted just above the output valves, these caps are in a fairly
stressed location, I recommend you fit 105deg components.
This is the Grand Prix Moderne 608.
Not exactly the same as your 609 (different plug locations etc) but the style is correct :
Martin