This is not a clone but a fake. It looks like a modern ARC preamp but the inside is not. If it is a rip off of an ARC circuit, It has to be at least 30 or 40 years old. Modern ARC gear uses primarily 6H30 tubes. This uses 12AU7 and ECC88 tubes. This preamp is just like a fake Rolex, it looks like one on the outside. But it is not made like one and it won't work or last like one. And it won't sound like one.
If you want am ARC preamp, find a nice older used one. It will be built better and sound better. And if something goes wrong with it, it can be repaired.