amp part question

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im working on an amp and theres a part i need not sure what it is it has 8 leas on it and the numbers are smt b 472g wondering what that part is and what part number i might need to order a new one also there is smt b 103g's in the amp well one is missing and i found a smt b 102g wondering if thats the same as the 103 so i can put in it any help would be greatly appericated like i said i need a smt b 472g and maybe a smt b 103 g any part numbers would greatly be appericated
 
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