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Most people have the single tube version and I've never seen that schematic. The two tube version like you have is posted on CB Tricks. This is very similar to the Hornet without the meter. The small tube is part of the keying circuit so there is no driver, just the two tubes. You can expect output to be 125-150 watts.
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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