Monthly Archives: January 2007


2007/01/30     hiro hayashi       12F   What is 12F?   It is neither 12 degrees in Fahrenheit” nor 12th floor.   It is an ST type vacuum tube for a half wave rectifier commonly used in the power supply system in … Continue reading

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Homebrew straight key

2007/01/15   Homebrew straight key   I came across an interesting article showing a straight key in the QST magazine, September 2006 issue.  It was written by WA7WKX, Steve using a hinge and a cabinet knob.   As I go … Continue reading

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