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6EA8 , 6GH8 , 6U8 all compatible?
Going through my tubes i fing one that is nos , it says 6u8 / 6ea8 on the box and the tube , i look in the substitution book and see 6u8 will sub for 6ea8 but it notes parallel filamints , so my question is will a 6u8 work in place or 6ea8 ?
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