Well, I can tell you that in terms of gain/volume matching, a 10X into 323 E boards is pretty much on par with a Naim CDX2. Whereas there is a significant difference, into N boards. (I did this trial using my 72 - for which I got a pair of E boards.)
I would expect that a 10X into S boards might be a bit louder than CD…?
Yes, I now have to make sure the volume is set low before playing records, the inverse of how things used to be 
Perhaps you could think about getting your 523 S boards converted to E spec… 
I’m hoping to get my boards to ‘K’ spec with an Krystal cartridge
My 10x has 525+ albums on it so there’s no rush just yet…or is there? 
You are excused, in that case… Many years back, I ran an Linn Asak, then an Asaka, into S or K boards.
Latest News - !!
The required Parts are now available…!!
A trip North is in the offing… 
Been to Moorgate today and ordered a Krystal. Might be fitted by Friday…
And came back with Patricia Barber - Modern Cool on double LP 
My trip to ‘next door’, is still pending… 
Don’t really know what a Krystal is, sorry. Something Linn, based on the ‘K’…?
It will look much better when its finished…
I see its around £1200… ‘Only’… 
@Guinnless - Update…! To complicate an already complex situation, a pre-loved Linn Lingo Mk1 seems to be heading my way… 
My Krystal has been delayed just waiting on a phone call.
The Lingo 1 is a huge improvement over anything other than newer Lingos or a Radikal.
@Guinnless - I have managed to arrange collection of the Lingo 1 (for later this week). As long as it works, I am happy - it will replace a 1982 Valhalla.
Now waiting on Class A, re servicing of the Lingo - and (back to the original subject) my Naim 523 boards…!!
You’ll not be disappointed with the Lingo. I bought in new when they came out and it was the most astonishing upgrade.
My 523s are now ‘K’ versions and the 82 has had its BNCs replaced by phonos.
@Guinnless - I hope not. Arranged to pick it up this Thursday.
Should be straightforward… 
So you are Oh ‘K’-ay then…
You went from S to K - thats not much of change…?
@IanRobertM ask Darren about removing the mains filter on the lingo. It’s something that can effect Naim equipment.
Yep, I had mine sorted and it made a nice positive difference - tested before taking it by simply unplugging the Lingo and listening.
Krystal and. T-Kable now fitted and to be collected tomorrow. It’ll have to be an early start in the morning to avoid Glossop car park!
