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2SA1302. 15 Amp, 150 Watt rating. More to the point, it has a larger surface area in contact with the heat sink. That alone means the part's temperature will rise less per Watt of heat than the smaller physical packages can allow. Temperature rise is all about the thermal resistance between the part and heat sink. Bigger contact area means lower thermal resistance in degrees temp rise per Watt.
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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