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I honestly think i got a REALLY good batch of IRF520s. My DX949 blew its Final and Driver over the winter due to accidental keying up and modulation without antenna hooked up. I ordered a batch of IRF520s and ever since have been running the Dx949 with them at 4.0 with absolutely no problems at all. Ive made contacts all over the world with it and steadily get reports of great audio. Only time ive had a heating issue is when Im "competing" down on the superbowl and really getting on the mic. When I did this mod to the DX959 I took out the 520s that were inside it and put 3 of the 520s from my batch in so as to keep them all the same. Ive had weird experiences over the years with components supposedly of the same brand and size not matching up well because of being from a different batch. I know 4.1 sounds a bit high on the voltage but I really feel comfortable with where they are at with the heat sink and fan installed. The person who will be using this radio isnt a big talker and rarely shoots skip hard. We do live in a very hilly area with deep forest and Rural and he wants to be able to stay in contact with us on all his travels. Im gonna let it run with him like this for awhile and if anything happens I still have a bunch of 520s left to swap in and make changes.

Ive never heard of these 13n10 mosfets you are talking about? Are they a direct drop in replacement for the 520? And what about a Cobra 148GTL with a 2166 driver and 1969 final....? I wanna upgrade that radio to mosfets but havent found anything with good enough directions to make me feel comfortable doing it.

<blockquote data-quote="8113 Northern MN" data-source="post: 492753" data-attributes="member: 36805">I honestly think i got a REALLY good batch of IRF520s. My DX949 blew its Final and Driver over the winter due to accidental keying up and modulation without antenna hooked up. I ordered a batch of IRF520s and ever since have been running the Dx949 with them at 4.0 with absolutely no problems at all. Ive made contacts all over the world with it and steadily get reports of great audio. Only time ive had a heating issue is when Im &quot;competing&quot; down on the superbowl and really getting on the mic. When I did this mod to the DX959 I took out the 520s that were inside it and put 3 of the 520s from my batch in so as to keep them all the same. Ive had weird experiences over the years with components supposedly of the same brand and size not matching up well because of being from a different batch. I know 4.1 sounds a bit high on the voltage but I really feel comfortable with where they are at with the heat sink and fan installed. The person who will be using this radio isnt a big talker and rarely shoots skip hard. We do live in a very hilly area with deep forest and Rural and he wants to be able to stay in contact with us on all his travels. Im gonna let it run with him like this for awhile and if anything happens I still have a bunch of 520s left to swap in and make changes.Ive never heard of these 13n10 mosfets you are talking about? Are they a direct drop in replacement for the 520? And what about a Cobra 148GTL with a 2166 driver and 1969 final....? I wanna upgrade that radio to mosfets but havent found anything with good enough directions to make me feel comfortable doing it.</blockquote>

[QUOTE="8113 Northern MN, post: 492753, member: 36805"] I honestly think i got a REALLY good batch of IRF520s. My DX949 blew its Final and Driver over the winter due to accidental keying up and modulation without antenna hooked up. I ordered a batch of IRF520s and ever since have been running the Dx949 with them at 4.0 with absolutely no problems at all. Ive made contacts all over the world with it and steadily get reports of great audio. Only time ive had a heating issue is when Im "competing" down on the superbowl and really getting on the mic. When I did this mod to the DX959 I took out the 520s that were inside it and put 3 of the 520s from my batch in so as to keep them all the same. Ive had weird experiences over the years with components supposedly of the same brand and size not matching up well because of being from a different batch. I know 4.1 sounds a bit high on the voltage but I really feel comfortable with where they are at with the heat sink and fan installed. The person who will be using this radio isnt a big talker and rarely shoots skip hard. We do live in a very hilly area with deep forest and Rural and he wants to be able to stay in contact with us on all his travels. Im gonna let it run with him like this for awhile and if anything happens I still have a bunch of 520s left to swap in and make changes. Ive never heard of these 13n10 mosfets you are talking about? Are they a direct drop in replacement for the 520? And what about a Cobra 148GTL with a 2166 driver and 1969 final....? I wanna upgrade that radio to mosfets but havent found anything with good enough directions to make me feel comfortable doing it. [/QUOTE]

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