Alright Sherman, it’s time to join Mr. Peabody and “Set the Wayback Machine” for 1970. We have arrived in an average-sized Midwestern town where we will visit two electronics operations—one a television repair shop and the other a ham radio shack. Observe closely, for we are looking for something very useful that can be brought forward to today’s electronics workbench. Remember that these are still the waning days of the vacuum tube  Solid-state is becoming more common in home entertainment applications–but for the ham, repair technician, and experimenter, much of the equipment is still firmly based on “hollow state” devices.…