Pete has been trying to talk sense on this issue for a long time, but some folks just won't listen.
You need to have a reverse polarity protection circuit in your rigs AND you need to carefully determine fuse size needed for normal operation. If your final transistors for some reason start pulling more than the normal amount of current, the fuse will blow before your PA transistors release their smoke.
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Today, fuses cost more than the transistors they "protect". A power supply with appropriate current limit does a far better job.
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