Voltaire, I looked up the info from the Divine Purpose publication, circa 1958. It gives the Society's version of events. It stated beginning on page 120 that " the radio station WBBS began on February 24, 1924, the president of the Society inaugurated this station by delivering an important lecture entitled "Radio and Divine Prophecy". Live broadcasts of Rutherfords' lectures called "The Watch Tower Hour" with introductory and concluding music furnished by an orchestra maintained by the Society began November 18, 1928 and they continued through 1930. "For more than 3 decades it broadcast as a noncommercial, educational station throughout the entire New York metropolitan area and the neighboring states of Connecticut and New Jersey".The live broadcasts were surplanted in 1931 with what was called "transcribed lectures" on records because the live broadcasts prevented Rutherford from traveling and organizing conventions according to page 122. These 15 minute talks allowed the society to rent telephone lines by the hundreds for simultaneous broadcasts over hundreds of radio stations. This was called the "wax chain". In 1932 this "wax chain" had expanded to more than 340 stations. Rutherfords' attacks particularly against Roman Catholics created public backlash and the demand to take Rutherford off the airwaves. In 1934 the Society began using colporteurs in the use of using phonographs both from cars and at the doors subjecting the neighbors to these prerecorded "lectures".The Society stated it was very successful .On page 138 it says on October 31,1937 the Society withdrew from the airwaves but prior Rutherford spoke on nationwide radio on the concluding day at an assembly in 1937 that the broadcasts were ending and that it was because of a 10 year boycott and intimidation that had been practiced by the Roman Catholic Hierarchy and other clergmen.
Hope this helps. I had to sift thru many pages on the subject reading Tom and Johns' supposed conversation &>:(
Allen