12-04-2016, 11:29 PM
The link below shows two early Philco ads (November and December 1933) for the 16B cathedral. As Ron stated, both ads show a small knob used for the band switch. A third and later ad (April 1934) shows a larger rosette knob for the band switch.
http://www.tuberadioland.com/philco16_ca..._main.html
http://www.tuberadioland.com/philco16_ca..._main.html