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why is not so easy to make sure the quality with Russian type fast Thyristor?

why is not so easy to make sure the quality with Russian type fast Thyristor?
Update Time:2017-02-14
Russian type fast Thyristor(capsule version) such as TB143-500 TB553-800 Etc  is a kind of fast Thyristor which widely used in big power transformer ,AC/DC motor control  , inverter ,welder etc , for this kind of thyristor , the  higher Vrrm (repetitive peak reverse voltage) , the longer turn off time will requirements