Just use Richard D’s picture
And Richard PW’s picture
1,4 and 2 for output, 3,5 and 2 for input
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This is why I took a photograph of what is physically moulded into the connector by the manufacturer. It seems there are many contradicting images available online which doesn’t help matters.
Hopefully this doesn’t break the diy rules but when I made my own DIN to RCA lead for connecting a Quad headphone amp to the Tape DIN on my Nait 1, I used pins 1 and 4 for L and R with 2 as ground and it worked perfectly.
The din pin out numbering does not help.
But, the OP needs to buy a din that is wired to 1,4,2.
Ebay will sell you what you need.
I have bought a few din to rca connector things, as I need to get signal in and out of my 72 ( similar to the OP).
They are 3, 5 and 2 - I’m sure
For reference, here’s one of my cables wired as an input (ie source to amplifier) cable - you can see pins 5,3 and 2 connected. You need 1,4 and 2 for your setup.
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That’s wrong too! This is such fun! Is it really that hard to understand the picture that Richard posted above?
Surely your photo shows 1, 4 and 2 wired??
This is all getting very confusing. The pinout is standardised, find it here, on Wikipedia or a ton of other places:
There’s nothing Naim specific about it AFAIK.
The only complex thing is the wiring, which needs to be different on the direction. Whoever designed it decided to make it easy for the manufacturer, difficult for the consumer.
A picture of a PCB mounted DIN5 (female/sockets).
compare the above with the amplifier, here:
So “Rec outputs” at rhe amplifier would be 1 & 4, with Sig Rtn on 2.
That correlates with @james_n 's photo (below) of the Preh cable connector (male/pins) - note that James’s photo is of the rear face (solder bucket side) of the Preh so the numbers would be reversed from commonly found diagrams which usually show the front (mating) face.
Note also the Wiki page referenced by @n-lot shows that at the amplifier, Pins 1 and 4 are defined as Audio Out.
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I bought mine from Teddy Pardo. Go their website and you can choose which version of DIN to RCA to chose to connect to a HP amp. It sounds as good as my Chord Sarum T from out of my ND555 to the HP amp.
It’s relatively cheap.
The Naim pictures appear to follow convention, I soldered many a din plug like this in my youth, they were much more common then. They are a little fiddly its true but not exactly brain surgery!
In the post Xmas period, I made up a couple of DIN to RCA adaptors for use in the Headline’s input, using both male and female in-line Preh DIN5’s. I’ll open one up later on to see if mine have numbers on the back.
Edit: They do indeed.
Although I confess that when I made them up, I opened up one of my Headline’s connectors, and taped it to the table in order to provide a visual aid!
Its really not this difficult…!!
Here is a picture of my 5 pin Din to 2 Phono lead. Its a Chord lead, which was built as a 4 pin Din to 2 Phono (the arrows are correct for this), which I mod’ed to 5 pin (just swapped the pin assy). Soldering was tricky, but I did my best…
Its wired 1-2-4 - as per @suzywong and others, above. And it definitely works, when fitted between my Naim 82 and my Rega Ear.
Will that do…?? 
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All I’ve got to say on the matter is…thank heavens that forum rules don’t permit discussions about how to wire up a 19 pin Burndy 
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Carefully… 
But, as its a Naim part, such discussion would not be allowed… 
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The photo shows how the cable just received and not working is wired. The other photo shows Richards diagram. The male plug seems to me to be wired to pins 1, 4 and 2. The supplier has seen the photo and says it is wired to pins 3, 5 and 2.
IMO, this cable is wired as a Phono -TO - DIN - so its wrong for what you want.
Its visually 3-5-2. Exactly correct as per @Richard.Dane 's picture you show above.
The Male pic will be looking ‘at’ the pins - or ‘at’ the plug - from the front - not from the wire side.
Its simple. If it doesn’t work its wired wrongly. But… YMMV… this is the Internet…
Sorry, but I will give up at this point. Please contact whoever you got the cable from. I hope they will help you, but if you asked for the wrong cable, then maybe not.