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Highest current, wattage device as drop in replacement for 2SK2570 N-Channel FET

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OCDaudio

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I would like to put the highest current, wattage, voltage rated device in an amp. This is used for a ripple filter in the PS. This is my first post and I do not understand the code thing. OCD
 

You did not post the schematic that will show why you need a linear ripple filter that wastes a lot of power making heat.
Most audio amplifiers do not use a ripple filter or a regulated power supply because they have a good Power Supply Rejection Ratio. A pretty big main filter capacitor keeps the voltage high enough for the rated power output and its few volts of ripple is almost unmeasurable and not heard at the output.
 

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