Mike Higgins' Hickok tube tester calibration monograph

Update: note new URLs.

I'm honored that Mike Higgins has allowed me to host his monograph Accurate Calibration Of The Hickok 539B And Hickok 539C Tube Tester on my website. The current version is a draft under construction. Once we have the final version, I'll post a note here. It is available as both a PDF file and in html form. They are also included in the list of Antique Electronics and Vintage Solid State Links in the navigation bar to the left.


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