Cover of Radio News magazine's September "Special Tube Data Issue," priced 25 cents. A large Art Deco-style vacuum tube in blue, yellow, and orange dominates the red cover. Headlines read "An Untuned R.F. Coupler for Screen-Grid Tubes," "The 1930 Amateur Regulations," "How to Judge Tubes," and "Complete Tabulation of Tube Characteristics." Signed by artist David Hymes.