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A56120X

Large 55–56 cm-class monochrome television picture tube for high-voltage direct viewing, with manufacturer-defined magnetic deflection, focusing, and screen characteristics.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B12F
Base pins: -
Nominal heater: 6.3 V / 900 mA

Description

The Mullard A56120X is a 56 cm rectangular shadow-mask colour television CRT with three electron guns and metal-backed three-colour phosphor-dot screen

Socket description

All-glass CRT 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B12F
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 900 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

No fixed ratings are recorded for this section.

CRT section. Maximum ratings, operating conditions, capacitances, optical and mechanical values are preserved as parameters where published.

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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
300 mA
UsefulScreenDiagonalMinimum
533 mm
UsefulScreenWidthMinimum
447 mm
UsefulScreenHeightMinimum
337 mm
DeflectionMethod
Magnetic
Deflection Angle
90 degree
ElectronBeamCount
3
ScreenConstruction
Shadow-mask three-color phosphor dots

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Heater Voltage
6.3 V
Heater Current
900 mA
Focusing Method
Electrostatic text
Deflection Method
Magnetic text
Deflection Angle
92 deg
Light Transmission
53 percent
Approximate
Grid Cutoff Voltage Range
-65 to -135 V
EachGun; Va1=300V
Light Output at Screen Centre
120 cd/m2
FocusedRaster
White Point x
0.281 ratio
White Point y
0.311 ratio

Other

Final Anode Voltage
25000 V
EachGun
Focus Electrode Voltage Minimum
4200 V
EachGun
Focus Electrode Voltage Maximum
5000 V
EachGun

Data set 03

1976 ITT Picture Tubes

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

tion angle and
36.5 mm
The useful screen area of
1465 cm
has nearly straight sides of 44 x
35 cm
(appr.) with 3 x4 aspect ratio. The filter- Minimum Useful Diagonal
533 mm
glass of the faceplate has a light transmis- Screen Dimensions Horizontal
447 mm
sion of 52% (appr.). Vertical
337 mm
trianguiar dot groups - colour triplets - Area (approx.)
1485 cm
Neck Diameter
36.5 mm
phosphor is composed of yitrium com- 472 +
35 mm
The tube uses three electrostatically focus- Weight
15 kg
Cgdg5alm min
1700 pF
Ugdgsa max @ i
27.5 kV
Ugdgsa max @ i 27,5kV CgdgSalm’ (approx.) (2)
280 pF
Ugagsa min
20 kv
!§
4 ohm
Ugz 5 max
1 kV
‘:_Ugl) P max
400 V
(=Ug1) max
200 V
U-Hk max 1 @@
410 A
Ul max2®@@
250 V
nearest centre of screen
0.64 mm
Uik B max @
180 V
U+fﬂ<_max @
135 V

CircuitDesignRatings

Ur @
63 V
B (@approx.)
9 A
=
150 V
=%
5 uA
<+
5 uA
Uadg
5 a
Uadg5a B r (2)
25 kV

Capacitance

Ug2 ot @ ®
210 to 495 V
at (_Uy)
105 V
(_Ugﬂ} cutaff '@
70 to 140 V
Cx - (approx.)
5 pF
at -Ugz =
300 V
at -Ugz = 300V Cg3 (approx.) (2)
6.5 pF
CgdaSa/m max
2300 pF