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Learn Computer Repair at Home. Start a Computer Repair Business from Home. http://www.ebay.com/sch/probusinesskit/m.html?_nkw=&_armrs=1&_from=&_ipg=25&_trksi…
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Warm Tube Indicator

This LED indicator is inserted between the B+ and the plate resistor. It lets you know that the power is on and, more importantly, the tube (valve) is warmed…
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Learn how to use an inexpensive USB software defined radio (SDR) to eavesdrop on pager messages in your area. You would be surprised how many people still re…
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