Specialized - Cathode Ray ·CathodeRay
Twenty-one-inch direct-view all-glass television picture tube with magnetic focus and magnetic deflection. It provides a large rectangular picture and uses an integral magnetic focusing unit requiring no external ion-trap magnet, gray face glass, and high-voltage operation for monochrome receiver service.
The 21ARP4-A 1s a magnetic-focus and magnetic-deflection, direct-view all-glass plcture tube which provides a 19-1/8 by 14-3/16-inch pilcture for television applica- tions. In this tube, a magnetic focusing unit which is an integral part of the elec- tron gun permits a sharp over-all focus adjustable through a wide range of anode volt- age by a shunt sleeve around the tube neck. An external ion-trap magnet 1s not re- quired and should not be used. Other features of this tube include a high-quality gray faceplate which increases picture contrast and detail wunder high ambient 1light conditions, a reflective aluminized screen to 1ncrease 1light output, and a space- saving rectangular face shape. An external conductive coating serves as a filter capaclitor when grounded.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Typical Anode Voltage
16000 V
Typical Grid No. 2 Voltage
300 V
Grid No. 1 Maximum Negative Bias
125 V
Grid No. 1 Maximum Positive Peak
2 V