Note
Service magazine, Nov 1937, p. 665.
Service magazine, Jan 1938, p. 37. (a few details)
Radio's Master Encyclopedia, copyright 1937, second edition, p. F-1.
Radio Craft, Apr 1938, p. 707.
Radio News, May 1938, p. 67.
Features what Triplett called turret-tube mounting. This permits easy adjustment of the tube up or down, or to either side, so that the screen is always in direct view of the operator. An adjustable shield permits easy reading in brightest daylight.
Linear sweep from 15 to 20,000 Hz. Model 1690 2" oscilloscope is furnished in two case styles– Deluxe leatherette, or metal with black wrinkle finish. The 3" oscilloscope, slightly larger, is in the metal case only.
1690, 2 inch, $47.00
1691, 3 inch, $62.50
References
Brief description. Radio News, Sep 1937, p. 186.
Brief description. Service magazine, Feb 1938, p. 32.
