|..extracts from 1933 Zenith advertising.
|"8-tube Superheterodyne, Shadowgraph tuning, advanced type automatic volume control. 8" dynamic speaker. The cabinet has
matched butt-walnut front with pilasters inlaid with genuine marquetry and overlaid with maple burl. Reeded ends. Hand rubbed,
hand polished finish. Size 191/2" high, 16" wide, 91/2" deep"
"Here's the device that makes every child or grown up an expert tuner. When a station is not tuned to exact resonance a wide
black shadow appears on the screen [ed]. As the station comes closer to the peak, the shadow becomes smaller, until finally, when
tuned "on the nose", only a narrow black vertical line shows. Result: full rich resonance, not a rasping sound."