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Hi alll , i have a circuit board of an amp which requires a new set of transistors (BD(912). are there any high power transistors which can replace these ones preferably Mosfets and are there any other things that need to be changed if i am to replace them.
There are probably high power transistors that will swap in. However... these are BJTs which have very different electrical characteristics from MOSFETs, the most notable (to me at least) is the fact that BJTs are current driven, while MOSFETs are voltage driven. The simple answer is to replace with a compatible BJT.
Is the problem that you can't find these transistors? Another option is to see if NTE lists a cross reference. (that's the only place I know of that has a convenient cross ref online, but maybe there are others).