IRF540 or IRF3710............................

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The amp it's an arcam alpha 5, on the final stage the mosfets are died and I've to change them all.
Arcam says that "substitutes" are IRF540 or IRF 640, but I have many Irf3710 and to me (if I'm not blind) the irf 3710 looks more similar to first ones than 640 types......
 
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