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21AP4

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: -
Socket code: B12D
Base pins: 5
Nominal heater: 6.3 V / 600 mA

Description

Direct-view cathode-ray picture tube for television display service. Electrical ratings, operating conditions, capacitances, optical data, and construction details were extracted from the supplied datasheet.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
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

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: 18000 V
Max screen voltage: 5 V

Published maximum ratings and electrical characteristics promoted from the approved source.

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

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
600 mA
Nominal
Maximum Plate Voltage
18000 V
UltorVoltageMaximum
18000 V
GridNo2VoltageMaximum
500 V

Data set 02

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 anode voltage
18000 V
Typical operating conditions
Typical grid 2 voltage
300 V
Typical operating conditions

Characteristic

Vertical deflection angle
50 deg
Diagonal deflection angle
70 deg

Capacitance

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

Data set 03

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

UNIPOTENTIAL CATHODE
6 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
EXTERNAL — value 1
13
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
EXTERNAL — value 2
15
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
EXTERNAL — value 3
16
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
FACEPLATE LIGHT TRANSMISSION
66 percent
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
OC GRID #3, GRID #5, COLLECTOR VOLTAGE — value 1
3 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
OC GRID #3, GRID #5, COLLECTOR VOLTAGE — value 2
5 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
OC GRID #3, GRID #5, COLLECTOR VOLTAGE — value 3
14000 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC GRID #2 VOLTAGE — value 1
2 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC GRID #2 VOLTAGE — value 2
300 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC IJN TRAP CURRENT STANDARD COIL #111 (APPROX.) — value 1
111 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
DC IJN TRAP CURRENT STANDARD COIL #111 (APPROX.) — value 2
9 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
SIGNAL VOLTAGE AO JU STED TO PRODUCE A HIGHLIGHT BRIGHTNESS OF 30 FOOT LAMBERTS OM A 18 3/B" BY — value 1
30 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
SIGNAL VOLTAGE AO JU STED TO PRODUCE A HIGHLIGHT BRIGHTNESS OF 30 FOOT LAMBERTS OM A 18 3/B" BY — value 2
18 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
SIGNAL VOLTAGE AO JU STED TO PRODUCE A HIGHLIGHT BRIGHTNESS OF 30 FOOT LAMBERTS OM A 18 3/B" BY — value 3
3 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
13 15/16" PICTURE SIZE. DISTANCE FROM REF Eft ENCE LINE TO CENTER OF AIR GAP OX FOCUS COIL SMALL — value 1
13 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
13 15/16" PICTURE SIZE. DISTANCE FROM REF Eft ENCE LINE TO CENTER OF AIR GAP OX FOCUS COIL SMALL — value 2
15 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
13 15/16" PICTURE SIZE. DISTANCE FROM REF Eft ENCE LINE TO CENTER OF AIR GAP OX FOCUS COIL SMALL — value 3
16 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

Other

MAXIMUM DC GRID #5, GRID #5, COLLECTOR VOLTAGE — value 1
5 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC GRID #5, GRID #5, COLLECTOR VOLTAGE — value 2
5 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC GRID #2 VOLTAGE — value 1
2 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM DC GRID #2 VOLTAGE — value 2
5 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM GRID #1 VOLTAGE
1 V
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM GRID #1 CIRCUIT RESISTANCE — value 1
1 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.
MAXIMUM GRID #1 CIRCUIT RESISTANCE — value 2
1.5 mA
Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.