Do they heat up at idle or only when it's driven hard?
Were they clamped to the heatsink when they were heating up?
It is possible that the gate resistance is too high. These input capacitance of those FETs is significantly higher than the originals (likely IRFZ40s or BUZ11s).
Were they clamped to the heatsink when they were heating up?
It is possible that the gate resistance is too high. These input capacitance of those FETs is significantly higher than the originals (likely IRFZ40s or BUZ11s).
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