Seems like the change was made around 2020?
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2019/2020-ish rings a bell for me too.
Just checked my pile of hi-fi invoices (ouch!), and my 500 (c. late 2007?) was DR-ed and serviced in 8/2008 for £4900 as part of the twin deal at the time. It make senses to do this, as even a service on a 500 is quite a bit of work AIUI – there were some pics on the old Forum.
When Naim changed the protocol, I think it was timed to recognise that anything going to them would invariably be due a service in any event, noting the twin offer had been extant for some time i.e. there was really no logic in not taking up the twin offer if you wanted the DR upgrade.
As above when a 50p gets dr’ed it’s only the amp bit that gets done, nothing in the power supply change.
The dr conversion replaced everything apart from the main case, the boards are different, etc.
So you have basically a brand new 500 when dr’ed.
When mine got done the power supply wasn’t done, as i checked myby looking at the dates on the capacitors inside the power supply.
But i sent it off along with my 552 when i got that dr’ed. But it’s certainly something to check on them.
I have never understood why Naim stopped the DR upgrade option.
It was explained to you when you made the same comment, just last month.
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That’s not my idea of an explanation!
Quite a reserved comment??? - I was expecting WoW!!! (hopefully in a few days)
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one thing i would be tempted to do if you can…
get the turntable on the left top stack.
52 on the top middle stack, that will leave a nice gap between your nds and pre.
hows it sounding mate?
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It’s warming up @Ian. Only turned it on half an hour ago 
It is sounding fantastic! Was quite a mission to set up so I am recovering from that!
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It sounds massive. Bass is deeper, more slam. Instruments sound more real and three dimensional. Bigger, bolder and deeper. It’s very early days. Was glad to.set it up with no glitches first time round.
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mate thats brilliant, its going to take a few weeks at least i think
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The LP12 was jumping if you walk near it, and I was going to strengthen my subfloor this weekend. However, as luck would have it the extra weight of the 500DR now means this problem has gone!
It’s certainly something to consider and with my layout at beginning of this topic I said I welcome suggestions. The 555PS was on middle Fraim before and NDS on top of left stack.
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aaaaaah really, it does make sense the extra weight on the rack would help out.
I dont have a turntable but my floor is suspended
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I think my floor maybe floating floor. Chipboard on insulation boards which is worst for turntables. It’s improved now with 500DR weighing the stack down. I may reinforce floor but it seems better, if not great. If I jump up and down then it moves the record. If I walk normally it is fine now. Just don’t put LP12 on at parties!
If you get a chance, try swapping the upper two shelves on the middle rack. It will get the 52 further away from the NDS.
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So the NDS has more space and 52 less. Will certainly look better.
Will do it tomorrow. Shelf spacing will look better. Does the 52 need more headspace though. Will LP12 affect it?
With 500DR I noticed after I built system that rear ball bearing under glass is right on the edge of glass so it’s an opportunity to address that too!