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it is late but it is twards the back of the radio between the two tuning cans tr7 think i beleive it is a 1764. dont quote me on that. i would replace with a 2sc2999 if you can get it. i will double check later to confirm this.
the receiver front end transistor is a 2SC1674. in most cases this device survives front end overload but either one or both of the 1N914/1N4148's short or blow open. that would be a good place to start.
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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