Hi @Guinnless, thanks for your help. I wasn’t aware of any other fuses, is the pop out on the 500 main body or it’s ps and do you know what type of fuse it uses, I’ll have to order one in pdq.
It’s on the PS next to where you plug the mains cable in. There should be a spare in there too.
The label will tell you which fuse type it is.
What Guinnless said. To the right of the IEC socket where the Powerline goes, there is a plastic cover that you can slide out.
The fuse values are printed onto the cover. After sliding out, it contains two fuses, the live one (which is the one further inward) and a spare. Also see FAQ https://community.naimaudio.com/t/equipment-fuses/7998
I don’t know which fuse value the 500 requires, but the fuse is most likely as follows:
Manufacturer: Littelfuse
Series: 213
Size: 5x20mm
Type: Antisurge (“T”), slow-blow
Rating: Not sure as I have no 500. It is printed on the fuse cover and stamped onto the fuse itself. Probably 3.15 Ampere like the 300PS and 555PS, which would be Littelfuse part number 02133.15MXP.
(Smaller units have 2.5 Ampere like the XPS and SuperCap, which would be the Littelfuse part number 021302.5MXP)
Your Naim dealer can supply (or there are shops like www mouser dot com). Get a bunch as backup
Very late edit for posterity: Apparently Tom Tom says it’s the 218 series:
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Bunch?
Mmmm, what could be a collective noun for fuses?
Gaggle? Pack? Herd? Flock? 
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One thing everyone should have in their toolbox, even if not technically minded is a mains tester with a voltage readout.
They differ from multimeters insofar as they are very basic and have (usually) no buttons at all. You just plug them in and they tell you the voltage and also have 3 lights which light in a certain order to tell you if
- Earth is truly grounded.
- Live and neutral are in phase.
- Earth and neutral are on the right pins.
Ideally, any new property you move into should be preceded by a quick whiz round to sanity test all the sockets. It’s good practice regardless of hifi intent. It tells you nothing of the quality of the mains but rules out dumbass mistakes when the wiring was done - some of which can actually lead to hum in some countries (I think this depends on whether the mains in your country has live referenced to neutral or to ground).
Here’s one example. They go for $20 or less.
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Possibly a “blow” of fuses?
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Like it, or a zap?
A “Pop Of Fuses” perhaps?
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I reckon a ‘box’ of fuses
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Good suggestion, just ordered the same for £10.
Brawn fraim rebuilt and fuse replaced.
We have music again 
We have humming again 
HumBuzg !
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Where are you located 00?
North, Wales… you?
I hope you confirmed it was for UK pin arrangement. That pic was from the US version.
Professionals wired my garage with the live and neutral transposed. It a savvy friend of mine to spot the issue 30 years after the work had been done. 
Mmm, God’s country…Essex.
I was goingbto suggest loaning you my dc blocker.
Same version available with 3 pin uk plug !