is it acceptable to replace an IRF540N with an IRF540? i've been told that replacing a 540 with 540N will not work sometimes but i'm not sure about the opposite. this one came in with one bank of outputs shorted on each channel. i turned the bias all the way down and checked the drivers and resistors. but when i power up the amp (limited current) the new fets get hot very fast (no audio).
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