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Reporting question for Vacuum Tube - 5AR4, Sovtek

Vacuum Tube - 5AR4, Sovtek

Is this brand suitable for a Dynaco ST70? I have found that the JJ rectifiers tend to blow after a few months. I want to stay far away from Chinese tubes...from my experience, they are not good to use in a Hi-Fi amp. Anybody using the Sovtek in their ST70?