If I am not mistaken, they are SMT-based amps? Most definitely made in China. Originally offered and sold through Thomann. The amp in question is a mass-produced OEM product from China that is marketed through various vendors such as Monoprice. There is an amp builder, whose name escapes me, that also sells them through his website. When I say OEM, I mean that one company makes it, but the product itself is sold under various names through multitudes of other vendors. Stage Right is one name, Harley Benton is one, and RMS Amps is another.
From the reviews I have heard and read, these amps sound decent, perform well and do what they say. The unfortunate thing is that they are expendable and likely to fail when you least expect them to.