sharp-cutoff tube

sharp-cutoff tube

[′shärp ¦kəd‚ȯf ‚tüb]
(electronics)
An electron tube in which the control-grid openings are uniformly spaced; the anode current then decreases linearly as the grid voltage is made more negative, and cuts off sharply at a particular grid voltage.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.