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Message: <blockquote data-quote="Spooney" data-source="post: 7209908" data-attributes="member: 584130"><p>A 1000 watt rms amp will not have 100 volt rails.The rail voltage is on the other side of the transformer from the power supply fets anyways. The fets in the power supply don't need to handle anywhere near 100 volts. Possibly the output fets would need a 100 volt rating but not in your amp.  I have an earthquake D2 here(2000 watts  rms) that only has 55 volt rated fets in the power supply. In addition this amp does roughly twice the power of yours and the rails are still only 80 volts. You do not need a 400 volt rated part in the power supply. It's your amp so you can put whatever you want in there but I wouldn't expect it to last long if at all with the IRF740 in there. It doesn't handle enough current for this application. It may work for a bit but you will end up having to replace the PS fets again. Best of luck on this repair.</p></blockquote><p></p>

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