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Modding HK4000 amplifiers - Visonik & MA Audio
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<blockquote data-quote="dB-r" data-source="post: 4476143" data-attributes="member: 574699"><p>They should be IRF9640's, not IRF9540's... wrong parts totally different. IRF9540 handles more current, but less voltage than a IRF9640. As for putting better mosfets in, possibly. I think the IRFB31N20D would be a good replacement possibly for the IRF640, but not sure what to use to replace the IRF9640's as they are P Channel Mosfets and not that popular really, and usually not near as robust as their N-Channel counterparts. IRF640=200V and something like 19-22 amps, whereas the IRF9640 is 200V, but only 11amps... LOL... Just the way it goes. That's why there is usually more IRF9640's than IRF640's in an amp that uses those parts.</p><p></p><p>If you try to change your outputs in your HK4000D you are doing it at your own risk, the high voltage can kill you and if you use the wrong parts (anything other than the original part) you are likely to blow up your amp or have other weird problems. To use different mosfets you may also have to use different drive circuits and different gate resistors due to different input capacitances of different mosfets. Lots of techno-BS.</p></blockquote><p></p>
[QUOTE="dB-r, post: 4476143, member: 574699"] They should be IRF9640's, not IRF9540's... wrong parts totally different. IRF9540 handles more current, but less voltage than a IRF9640. As for putting better mosfets in, possibly. I think the IRFB31N20D would be a good replacement possibly for the IRF640, but not sure what to use to replace the IRF9640's as they are P Channel Mosfets and not that popular really, and usually not near as robust as their N-Channel counterparts. IRF640=200V and something like 19-22 amps, whereas the IRF9640 is 200V, but only 11amps... LOL... Just the way it goes. That's why there is usually more IRF9640's than IRF640's in an amp that uses those parts. If you try to change your outputs in your HK4000D you are doing it at your own risk, the high voltage can kill you and if you use the wrong parts (anything other than the original part) you are likely to blow up your amp or have other weird problems. To use different mosfets you may also have to use different drive circuits and different gate resistors due to different input capacitances of different mosfets. Lots of techno-BS. [/QUOTE]
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Modding HK4000 amplifiers - Visonik & MA Audio
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