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This is a wild discussion. I never bothered with the RM3 or any of the RM amplifiers period, but now you got me interested. These are $68 and will output 100W? Where do you buy one for $68? Sounds like a neat experiment. IRF9530 is a P Channel Mosfet in TO-220B package, I would say, that's not the right part.

Input capacitance may not matter as much everyone thinks, seeing as how I know from experience you can replace the ERF 7530 (of whatever they call the TO-3P) one with a Fairchild FDA24N40F mosfet which has a "will not work" gate capacitance if you listen to the experts, but they are wrong it does work, I did it 10 years ago, only told a few people, but apparently recently the word has gotten out. I just happened to have those Fairchild parts in the parts bin for my amplifier repair shop (audio amplifiers) as many of the 2KW+ car stereo amps (Class D) were using originally a IRFP360LC but the price was of course high, so manufacturers started using the Fairchild equivalent, the FDA24N40F, with great success. Turns out they work in RF Amplifiers too, by some miracle that I cannot explain, I just know they work.

<blockquote data-quote="443" data-source="post: 778025" data-attributes="member: 15034">This is a wild discussion.&nbsp; I never bothered with the RM3 or any of the RM amplifiers period, but now you got me interested.&nbsp; These are $68 and will output 100W?&nbsp; Where do you buy one for $68? Sounds like a neat experiment.&nbsp; IRF9530 is a P Channel Mosfet in TO-220B package, I would say, that&#039;s not the right part.Input capacitance may not matter as much everyone thinks, seeing as how I know from experience you can replace the ERF 7530 (of whatever they call the TO-3P) one with a Fairchild FDA24N40F mosfet which has a &quot;will not work&quot; gate capacitance if you listen to the experts, but they are wrong it does work, I did it 10 years ago, only told a few people, but apparently recently the word has gotten out.&nbsp;&nbsp; I just happened to have those Fairchild parts in the parts bin for my amplifier repair shop (audio amplifiers) as many of the 2KW+&nbsp; car stereo amps (Class D) were using originally a IRFP360LC but the price was of course high, so manufacturers started using the Fairchild equivalent, the FDA24N40F, with great success.&nbsp;&nbsp; Turns out they work in RF Amplifiers too, by some miracle that I cannot explain, I just know they work.</blockquote>

[QUOTE="443, post: 778025, member: 15034"] This is a wild discussion. I never bothered with the RM3 or any of the RM amplifiers period, but now you got me interested. These are $68 and will output 100W? Where do you buy one for $68? Sounds like a neat experiment. IRF9530 is a P Channel Mosfet in TO-220B package, I would say, that's not the right part. Input capacitance may not matter as much everyone thinks, seeing as how I know from experience you can replace the ERF 7530 (of whatever they call the TO-3P) one with a Fairchild FDA24N40F mosfet which has a "will not work" gate capacitance if you listen to the experts, but they are wrong it does work, I did it 10 years ago, only told a few people, but apparently recently the word has gotten out. I just happened to have those Fairchild parts in the parts bin for my amplifier repair shop (audio amplifiers) as many of the 2KW+ car stereo amps (Class D) were using originally a IRFP360LC but the price was of course high, so manufacturers started using the Fairchild equivalent, the FDA24N40F, with great success. Turns out they work in RF Amplifiers too, by some miracle that I cannot explain, I just know they work. [/QUOTE]

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