Is Naim really still building MM boards for a 52? New old stock I could believe, but new?
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This is a potentially 30 year old amp. These may well be NOS atock
The demand for these boards will have been miniscule (in the wider electronics market context). I really can’t believe that anyone would go to the bother of making clones/copies.
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They look slightly different to the ones I’ve seen. @NeilS could probably confirm or not whether they are legit.
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I am sure these NOS eBay 5xx boards have been mentioned previously…
(search should be deployed)
There are NOS - they would have been built many years ago. They should have a number, such as 523/2 - signifying version 2 of the 523 board (*). They do not have Serial Numbers.
Probably will work, but a service should be considered… IMO.
YMMV, as always etc… 
(* think I can see 522/4B and 522/4T…? So they are MM boards. Top and Bottom…? 5xx boards are handed. Whereas 3xx boards are not.)
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PS. Checking my own 5xx boards, I can see B & T on mine, so thats right.
(look at the right hand edge of the lower 522 board - 522/4 T - just below the Gold contact)
More Naim Learning… 
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Previous posts re NOS 5xx boards -
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@snarfy what do you think is going on here? Sounds like you’re trying to get sound out of your P3 consistently. You can when it’s connected to a NAIT, but not with either of 32.5/3 series phono boards, or 52/5 series phono boards? Is that a fair summary? And if so, are you wondering if these 5 series boards are legit?
Is there anything common in the setup of the 32.5 & 52? Gently asking: did you fit the boards to both pre amps? 
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Not Possible. 32.5 uses 3xx boards, 52 uses 5xx boards.
Not The Same. Very Different.
Has either NAC worked before, with Phono boards…?
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Sorry, I meant in each respective case, did the OP fit the 3xx boards to the 32.5, and the 5xx boards to the 52. In other words, could they have been fitted incorrectly? And also why I asked gently Put another way, is the common factor the operator who fitted the boards?
Understood. Same Coin, Different Sides.
I have certainly managed to misfit 5xx boards (so NAC52 etc), which resulted in a dead channel. Refitting fixed it, though. 3 xx boards (so 32 etc) are easier to fit/remove - as the actual contacts are in clear sight.
I am more confused by the 32.5 not working, because of this.
I also wonder if there are links not cut involved. Hence my question - has either NAC worked with Phonos before…
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I have some Naim 5xx phono cards as well, previously owned 3xx cards as well, never noticed any serial number on these.
They were however marked 322, 323…etc.
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Thats correct, IMHO… 
Thanks for that.
I thought all the gear was numbered like Linn.
Schoolboy error. 
They look genuine to me.
We still build these!
Regards
Neil.
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Wow - really…? All varieties…? N, S, K & E…?
More Naim Info…!!
Fair enough, but the listing said they were authentic so I feel it’s been raised.
If I go back to them I want to be armed with some evidence that they are possibly not authentic.
Thank you Neil!
Thanks - I didn’t know new old stock (NOS) was the term to search for!
Its certainly an eBay ‘thing’… 
Old stuff, which is unused/unrun, often in its original box or packaging.
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Yes that is a fair summary. I get proper sound through the Nait 2, but no sound through the 32.5 with 3 series MM phono boards or with the 52 using 5 series MM phono boards. And yes I was wondering if the 5 series boards were legit (coincidentally).
Yes it’s entirely possible I did not fit them snugly enough. I will double check.
I used to own a P6 and ran it successfully through this 32.5, although it may have been with a different set of boards. I have never used these 3 series boards, so candidly don’t know if they work. They have been sitting in a cupboard in the garage for several years.
I have a 62 I can try the 3 series boards with shortly.
I do not know if the phono input on this 52 has ever been used successfully. Never tried it until now. It previously had line level boards fitted.
There is nothing in common with the setup of the 32.5 and 52. Completely different systems. The only common denominator was trying the P3/Exact with both. That’s why it’s so odd to me!
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