Note
QST, Jan 1954, p. 83.
Allied Radio catalog 1955 (copyright 1954), p. 190.
CQ, Mar 1962, p. 128. (Close out)
The Johnson Viking Mobile VFO was engineered to withstand road shock and vibration. It covered 75, 40, 20, 15, and 10 meters, which were calibrated on its edge-lighted dial. The VFO used three tubes and required both filament and B+ voltages.