Moving away from the bizarre claims above, can I ask a simple question:
With these Japanese amplifiers, and the Luxman in particular, who in the UK can service/repair them if it should be required some years down the line? As you know, I'm close to pulling the trigger on the 590 but - apart from the cost - the thing giving me just a little bit of pause is to get the reassurance that it is reliable and serviceable to justify being a 'final' amp. I'm not expecting problems, but equally if I still have it in 20 years time, it would be good to know that it can be readily serviced, caps changed or whatever it needs. The fact so many of their older amps are still in regular use is promising, but then these are not the 70s amps and likely incorporate differences that might make it difficult in the future.
Depends on the brand to a large extent I would think. Assuming you purchase from a UK dealer, then the dealer and local distributor are your first resource (dealer would normally forward to distributor for you if that's deemed necessary). Beyond that, who knows?
Relatively few of the smaller Japanese manufacturers export directly, typically they'll employ an agent and establish a distribution/service network for say Europe or the US markets. I think I'm correct in saying Accuphase used to arrive in the UK on that model, I don't know if things are different under the new distributor.
I had a two box CEC where both transport and DAC suffered a major lightning strike a few years back, that was returned by the UK distributor to their German HQ for a rebuild.
I'd have thought you're on fairly solid ground with Luxman, there's an IAG office in Huntingdon, which I think employs a number of service staff.
And as has already been pointed out, the design/complexity of the product will be a factor as well. Personally I wouldn't touch anything from the likes of Devialet with a bargepole, to me that's just a doorstop looking for something to prop open (mind you, don't they just throw some of their stuff away and give you a new one?).
Equally, anything imported direct from China is probably best viewed with at least one sceptical eyebrow raised (not that I'd be buying it at all).
If you want real security, the moral is probably buy a Sugden.
Ultimately though, 20 years?
Hah!
We'll all be dead by then anyway, either 'The Donald' will trigger WW3, a mutated Covid/Ebola hybrid virus will mean you can turn to soup even while typing on a hifi forum, or the machines will have risen and decided we're an infestation (another reason not to buy a Devialet, just in case the f*ck*rs become sentient and start trolling me on social media).