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21ACP4

Twenty-one-inch direct-view monochrome television picture tube designed for large-screen receiver service. Manufacturer data documents its magnetic scanning system, high-voltage operation, and picture-tube optical and electrical characteristics.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 12N
Socket code: B12D
Base pins: 5
Nominal heater: 6.3 V / 600 mA

Description

Direct-view television picture tube with magnetic focus, magnetic deflection, P4 white phosphor, and published high-voltage CRT operating data.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12N
Socket code: B12D
Base pins: 5
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12N - 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: 20000 V
Max screen voltage: 500 V

CRT section; Magnetic focus with magnetic deflection.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
6.3 V
Nominal
Heater current
600 mA
Nominal
Maximum grid 2 voltage
500 V
Typical grid 2 voltage
500 V
Typical operating conditions

Characteristic

Horizontal deflection angle
85 deg
Vertical deflection angle
68 deg
Diagonal deflection angle
30 deg

Capacitance

Cathode to all other electrodes
7 pF
Approximate

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Construction

Focusing method
Magnetic
Deflecting method
Magnetic
Phosphor
P4
White

Characteristic

Horizontal deflection angle
85 deg
Approximate
Diagonal deflection angle
90 deg
Approximate
Persistence
Short
Faceplate light transmission at center
71 %
Approximate

Capacitance

Cathode to all other electrodes capacitance
5 pF
Approximate
Grid #1 to all other electrodes capacitance
6 pF
Approximate

Other

Heater voltage
6.3 V
Heater current
600 mA
Maximum DC anode voltage
20000 V
Maximum DC grid #2 voltage
500 V
Maximum grid #1 negative bias magnitude
125 V
Maximum grid #1 positive DC bias
0 V
Maximum grid #1 positive peak
2 V
Maximum heater-cathode voltage during warm-up
410 V
HeaterNegative;Warmup<=15s
Maximum heater-cathode voltage after warm-up
150 V
HeaterNegative
Maximum heater-cathode voltage heater positive
150 V
HeaterPositive
Typical DC anode voltage
16000 V
TelevisionPictureTube
Typical DC grid #2 voltage
300 V
TelevisionPictureTube
Typical grid #1 visual-extinction range
-28 to -72 V
VisualExtinction
Focusing coil current
117 mA
Approximate
Ion trap setting
40 gauss
Approximate
X-ray shielding note
May be necessary above 16000 V
HighVoltageOperation

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

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