Re: [Elecraft_K3] K3 Question
William Conkling <bconk75@...>
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Download the Mod documentation and compare the pictures and descriptions to your radio. It's not hard to see when a mod has been done.
Except for the K3S I don't think there has been a pcb change in a long time if ever so most K3s have some mods done at the factory or by the board assembly tech.