I am a big fan of Copper Magazine.
I download the pdf version, so that I can read in a quiet time (most of times without internet on). Issue 131 pdf download is not available from the web site.
However, look at the the pdf download for issue 132, I trace back and found the issue 131 download is this https://www.psaudio.com/?issuem_pdf=true&issue_id=595.
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