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Most of the originals were OMRON.
Some are...MHE402PG-UA-DC6 2A28VDC/120VAC
Another OMRON...MHE405PG-UA-DC6 5A28VDC/120VAC
Have also seen Magnecraft... W67CSX-6 NOM VOLTS:6 RES OHMS:52 CONT RATING:3A
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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