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AS1721

Dark-trace storage cathode-ray tube with adjustable retained-image time. It stores a visible dark trace on the screen, allowing displayed information to persist without continuous refresh.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

The ITT AS1721 is a dark-trace storage cathode-ray tube with adjustable retained-image time.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Cathode Ray

X-ray radiationInterelectrode capacitances

Max plate voltage: 14000 V
Max screen voltage: 300 V
Max cathode current: 0.5 mA

Storage CRT; screen, focus, erase, and coating data retained in parameters.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1962 ITT

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Plate voltage rating
14000 V
Screen-grid voltage
300 V
Quenching power minimum
10 W
Quenching power maximum
15 W
Maximum cathode current
0.5 mA
Grid-leak resistance
0.5 Mohm
Average anode voltage
10000 V
Average grid 2 voltage
300 V
Erasing wattage
75 W
Focusing voltage
0 to 400 V
Biasing/cutoff potential
-86 to -40 V

Capacitance

Control-grid capacitance
7 pF
Cathode capacitance to all other electrodes
5 pF
Anode-to-external-coating capacitance
400 to 800 pF

Characteristic

Quenching-layer resistance
80 to 120 ohm