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place a 2200 ohm (red, red, red) resistor across the middle pin of the pa jack and the middle pin of the external speaker jack. you can do it on the rear of the board. that gives you quiet talkback.
Solder side, I find a 1watt 100ohm works well, loud enough to hear, not to loud. If you wanted to do variable talk back use a 500 ohm pot, 1/2 or 1 watt. Anything smaller will burn out.
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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