Waiting to hear back from Rocketbox directly and asked for pics and data sheets for the current HD-500 and the upcoming XL1000. I saw on one Facebook post to allow 3-5 days for build time (not exact quote) so I believe they are at least assembled in the USA.
I contacted an eBay seller as well as leaving a Facebook message and the builder is (from what I'm told ) currently on vacation but lives here in the USA in Las Vegas. Beat it up a little like you could with more rugged transistors and expect disappointment. If you understand this ahead of time and don't choose a model that will have to be pushed in order to reach your goal, you'll probably be happy with the cost and performance. They run hotter than the old bipolar transistors too. That bias also increases the operating gain of a part that struggles to maintain stability due to high inductance and the larger RF currents related to a lower operating voltage producing hundreds of watts. They include adding everything from extra resistors shunting the bias voltage across the gates to using transistors with much higher peak current ratings, hoping that will translate into some ability to sustain AB bias without failure. Because of that, the ones that are working are almost certainly relabeled switch mode transistors not intended to support bias or linear operation.Īll types of tricks are being used to make them function in the linear mode at the expense of reliability and durability.
People considering a 12 volt MOSFET amplifier should beware that not a single reputable transistor manufacturer is advertising a 12 volt linear RF MOSFET datasheet in this type of plastic package at power levels this high.
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