No-shock Switch Box.
The box has six outlets, and by setting a couple of toggle switches you can turn on one, two, three or four of them at a time.
Panel indicator lights warn that the power is on and show which outlets are hot.
But most important is that by putting the plug of the the radio you are troubleshooting into one outlet and the tester and soldering gun into the matching pair of outlets, you make it impossible to use the soldering gun or tester when the radio is on.
Two pages ( 2 sheets - front on both sheets ) B & W photos, illustrations, expanded view, parts list and instructional narrative.
My plans are from original source materials such as books, magazines and other publications and the pages are carefully removed.