On the back of my SWR SM-500 it says that it's "hand made". What do they mean by hand made? Is someone physically doing all the soldering and assembly, or just assembling and screwing the parts down inside the amp. I mean, the amp is excellent quality and built like a tank, but that doesn't mean a human hand did the dirty work. I'm interested to know because it seems like the term hand-made is kind of thrown around these days and interpreted very loosely. Thoughts?