Note
Service magazine, Nov 1936, pp. 564–565.
Radio's Master Encyclopedia, copyright 1936 (first edition), p. F-19.
Radio Craft, Dec 1936, p. 338.
Radio Craft, Feb 1937, inside front cover.
The 555 included an RF signal generator, an AF signal generator, and a wobbulator, in addition to the scope itself, and used ten tubes (unspecified).
No other specifications provided.
References
Brief description. Radio News, Dec 1936 p. 338.
