I don't have R-E handy, but "Mac's Radio Service Shop" shows up in the
May 1955 issue of Radio & Television News. ISTR that it was a regular in
the magazine. Also, wasn't Radio & Television News the predecessor of
Radio-Electronics Magazine?
  Didn't Radio-Electronics also have a regular
fictional series about the
 adventures of a repair-shop guy?  This would be back around the time of
 C&J.   
  Cheers,
 Chuck