Here's what I have read. Across multiple forums, I've read roughly 25 posts by people claiming to own one of the higher-end Chinese CV-181s. Their opinions have been very positive, all but one saying that they love the tubes, and other other one saying it is okay but nothing special. Five of them have reported that the tube went bad within 2 years. Not a terrible rate. And far from being a scientific study. Data from a tube reseller would be more valid.
I have no idea how many hours they put on them. I have no first hand experience with them.
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