Original video: https://www.youtube.com/watch?v=4kNMtOmT76U I have been told by techs I trust that Mesa Boogie's Randall Smith made it a common practice to intentionally falsify or otherwise obscure published schematics to prevent copying or cloning of his amps. This Bass 400 EQ-180A board seems like one of those instances. Mesa is already notorious for being tight-fisted with their documentation, refusing to honor requests for schematics on current production amps to just anyone, examples include the Mark Series and Rectifier series.
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