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has anyone tried this ia have the old 257 and would like to swap erf2030s in her i did find a new schematic for the 2030 model and many parts are gone from the original mainly around the final section.any info would be great!
The origional 257 was a dual 1969 final set-up. I would go with two irf520 mosfets. Thats is if the 1969's are smoked, if the radio works fine I would leave it as is.
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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