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 integral ion-trap and focusing assemblies, gray face glass, and high-voltage operation for monochrome receiver service.
The 21ARP4 1s a magnetic-focus and magnetic-deflection, direct-view all-glass picture tube which provides a 19-1/8 by 14-3/16-inch picture for television applica- tions. In this tube, an lon-trap magnet and a magnetic focusing unit are lntegral parts of the electron gun. The ion-trap magnet assures proper alignment of the elec- tron beam and eliminates the adjustable external magnet usually required. The focusing unit permits a sharp over-all focus adjustable through a wide range of anode voltage by a magnetic shunt sleeve around the tube neck. Other features of this tube include a high-quality gray faceplate which increases picture contrast and detail under high ambient light conditions, and a space-saving rectangular face shape. An external conductive coating serves as a fllter capacltor 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