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I posted this question about a year or two ago. The consensus was that although it can be done, the gain that you would realize (< 30 watts, IIRC) wasn't worth the effort.
With decent tubes that amp will cruise along all day long at 350 or so. Yes it will do 500+ if you drive the snot out of it, but it won't sound good and you will burn through those tubes a LOT faster.
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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