‰ NOW 15 WPM ‰ TEXT IS FROM JULY 2012 QST PAGE 55 ‰ AND A TUNER WAS DEFINITELY NEEDED FOR SOME LOADS, PARTICULARLY THOSE FOUND IN NONRESONANT SYSTEMS. WHILE MANY AMATEURS OF THE PERIOD USED HOMEBREW ANTENNA TUNERS, SIMILAR TO THOSE USED BEFORE THE WAR, BY THE MID 50S, E. F. JOHNSON INTRODUCED THEIR VERY POPULAR MATCHBOX SERIES OF ANTENNA TUNERS SEE FIGURE 4. THEY WERE PARALLEL TUNED CIRCUITS, SIMILAR TO THE EARLIER TYPE, BUT NOW BANDSWITCHED. IN ADDITION A UNIQUE DIFFERENTIAL CAPACITOR ARRANGEMENT PROVIDED A VARIABLE IMPEDANCE MATCHING FUNCTION SIMILAR TO THE ‰ END OF 15 WPM TEXT ‚