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From what I've been able to tell, Miraphone isn't mass producing the amount of rotary valves that say a Meinl Weston is doing. They use higher quality materials than Amati Cerveny as well.

I've really liked Miraphone rotars, they always feel really good to me as well.

Not a repair tech, but I concur with your positive experience with Miraphone rotary valves.

Cheers,