The amps can't get CE certification with exposed tubes. No way around that so most have an "optional" tube cover which nobody buys.
That amp looks like something from ETF so hardly commercial.
I've been down this road before and it is a dangerous way to DIY, as in I have these two parts, let's spend 400$ on parts for it...
As for those specs, the M3? It uses a single brick psu but sounds pretty shitty thanks to the rail splitting.
Ahhh yes, let's use some old carbon comp resistors and caps which are way past their sell by date. Yup...sounds like a plan.
The Riken and Koa's are pretty nice though but miles away from the old stuff.
The last picture is apt as the authorities are trying to keep people alive in that place. Basically if you venture into the surf you are done for as it will grab you and smash you to bits. Pretty sad how reckless people are here given that there are deathtraps everywhere.
Well you could recoat but it is not a simple thing to do. Well the actual process is simple but it has ramifications. First off, opening the drivers will introduce them to dust and squealing. Second you need to coat both drivers and getting right isn't so easy. You might end up with constant static hissing or massive charge issues.
Well the 007 is pretty much impossible to get now with a huge waiting list but a lot of the 009's popularity stems from one simple fact, it is the most expensive of the lot. Same thing for the new L700, how many have considered the L500 over the 700? Probably not many as more expensive is always moar bettah.