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It is a dual final radio. It uses a pair of 2SC2312's and a 2SC2166 as a driver. You might not find 2312's; they aren't that easy to find. If one or both of them has failed, you can replace them with Eleflow CB-20W's. Don't bother buying any of the 2SC1969 transistors on eBay or anywhere else - because they are likely to be Chinese made PHONIES!
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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