Note
QST, Jan 1936, back cover.
QST, Feb 1936, back cover. (good photo)
Radio, Jan 1937, p. 7.
The complete 40 watt phone and CW transmitter consisted of four separate units in a rack. The units could also be purchased separately, and the basic transmitter could evolve into a higher-power rig by adding to the original components. It used plug-in coils to cover the 160 through 20 meter bands.
References
Review. Radio News, Aug 1936, p. 87.