Alternatives & variations Download PDF datasheet

20MP4

Twenty-inch direct-view monochrome television picture tube with magnetic deflection and a white P4 screen. Manufacturer data specifies high-voltage CRT operation and focusing characteristics for large-screen receiver display service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Direct-view television picture tube with lowvoltageelectrostatic 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: -
Socket code: B12D
Base pins: 12
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: 16000 V
Max screen voltage: 500 V

CRT section; LowVoltageElectrostatic 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 anode voltage
16000 V
Typical operating conditions
Typical grid 2 voltage
500 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 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
LowVoltageElectrostatic
Deflecting method
Magnetic
Phosphor
P4
White

Characteristic

Horizontal deflection angle
66 deg
Approximate
Diagonal deflection angle
70 deg
Approximate
Persistence
Short
Faceplate light transmission at center
66 %
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
16000 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
14000 V
TelevisionPictureTube
Typical DC grid #2 voltage
300 V
TelevisionPictureTube
Typical grid #1 visual-extinction range
-33 to -77 V
VisualExtinction
Ion trap setting
115 gauss
Approximate
Maximum collector/grid #3/grid #5 voltage
16000 V
Maximum focusing-electrode voltage range
-800 to +1000 V
Typical collector/grid #3/grid #5 voltage
14000 V
Typical focusing-electrode voltage range
-55 to +300 V