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Yep. I bought these amps from a local Palomar builder 11 years ago, for I think about half or less than half of what they cost now. I may have been given special pricing though, was a friend. I had a 250FET and a 450FET. Used one to drive the other LOL. My feelings about these... If I don't get flamed too hard for sharing:

Firstly, I am a fan of using lower cost power devices, if they perform sufficiently.

Secondly however, I am not impressed AT ALL with these parts. They are so low gain that it doesn't make a lot of sense to waste so much real-estate on the board, and the heatsink to have this 1 x 2 x 4 x 8 scheme just to get to around 800-1KW output. If I had the resources to build a product for this category that RocketBox is in, I would use HG Semi 2879's or even MRF454 from MACOM. Just makes more sense, to me at least. I have found other, less expensive, but probably way better, TO3 case Mosfets that work in place of the ERF parts, but still the gain is the issue, not enough gain there to make it worth using IMO, not even at less than $2.50 per Mosfet.

<blockquote data-quote="443" data-source="post: 726655" data-attributes="member: 15034">Yep.&nbsp; I bought these amps from a local Palomar builder 11 years ago, for I think about half or less than half of what they cost now.&nbsp; I may have been given special pricing though, was a friend.&nbsp; I had a 250FET and a 450FET. Used one to drive the other LOL.&nbsp; My feelings about these...&nbsp; If I don&#039;t get flamed too hard for sharing:Firstly, I am a fan of using lower cost power devices, if they perform sufficiently.Secondly however, I am not impressed AT ALL with these parts.&nbsp; They are so low gain that it doesn&#039;t make a lot of sense to waste so much real-estate on the board, and the heatsink to have this 1 x 2 x 4 x 8 scheme just to get to around 800-1KW output.&nbsp; If I had the resources to build a product for this category that RocketBox is in, I would use HG Semi 2879&#039;s or even MRF454 from MACOM.&nbsp; Just makes more sense, to me at least.&nbsp; I have found other, less expensive, but probably way better, TO3 case Mosfets that work in place of the ERF parts, but still the gain is the issue, not enough gain there to make it worth using IMO, not even at less than $2.50 per Mosfet.</blockquote>

[QUOTE="443, post: 726655, member: 15034"] Yep. I bought these amps from a local Palomar builder 11 years ago, for I think about half or less than half of what they cost now. I may have been given special pricing though, was a friend. I had a 250FET and a 450FET. Used one to drive the other LOL. My feelings about these... If I don't get flamed too hard for sharing: Firstly, I am a fan of using lower cost power devices, if they perform sufficiently. Secondly [U]however[/U], I am not impressed AT ALL with these parts. They are so low gain that it doesn't make a lot of sense to waste so much real-estate on the board, and the heatsink to have this 1 x 2 x 4 x 8 scheme just to get to around 800-1KW output. If I had the resources to build a product for this category that RocketBox is in, I would use HG Semi 2879's or even MRF454 from MACOM. Just makes more sense, to me at least. I have found other, less expensive, but probably way better, TO3 case Mosfets that work in place of the ERF parts, but still the gain is the issue, not enough gain there to make it worth using IMO, not even at less than $2.50 per Mosfet. [/QUOTE]

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