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As a rule, the driver/final transistors are most often mounted on the frame because they need heat dissipation. If you take some pictures of the inside walls of your radio and post them up here, it would be a lot easier to identify them. Or use the schematic and trace it out:
Some of the older radios did not use TO-220 style cases bolted to the side rail for pre drivers/drivers/finals/, often they were the round TO-5/TO-52/TO-72 style cases with a round, finned heat sink pressed over them.
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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