A new piece of test gear for restoring/rebuilding vintage radios. Designed by Dick Whipple, the WSAB replaces a sweep generator and oscilloscope. This video describes generally what the WSAB is and how to build it.
Links:
https://www.nutsvolts.com/magazine/article/build-a-vintage-radio-sweep-alignment-instrument
https://whippleway.com/FromScratchBookFiles/VRA%20Info%20Landing.htm
https://github.com/rbwhipple/VRA-FS/releases/tag/WSAB_4pt1
www.jameco.com
www.mouser.com
www.amazon.com