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Tube Tinker — Electron Tube Database
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Specialized - Cathode Ray ·CathodeRay

A4727W2

47 cm monochrome television picture tube with electrostatic focusing, magnetic deflection, approximately 110-degree scanning, and high-voltage direct-view operation around 18–20 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
EIGHTAR7
Base pins
-
Nominal heater
6.3 V / 360 mA

Description

47 cm rectangular picture tube with 110° 2. Typical Operating Conditions deflection angle, electrostatic focusing, aluminized screen and steel reinforcement

Socket description

Eightar 7-contact CRT base family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
EIGHTAR7
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
360 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

1976 ITT Picture Tubes

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • A 47

    -27 W

  • Published value

    47 cm

  • Ur @

    63 V

  • I i 03+

    6 %

  • Ug3as

    5 a

  • Ug3as5a (2)

    20 kV

  • Ugr 400

    500 V

  • Ugg @ 0...400

    0 to 400 V

  • ¢ VA g3gga (-Ugt) cutott@40 ... 77

    50 to 93 V

  • Ukcutott@ 36... 66

    45 to 79 V

  • Ugagsa max &

    20 kV

  • Ugflgfia min

    13 kV

  • Rg3g

    5 a

  • U94 max

    1000 V

  • UgA_ p max

    2500 V

  • (-Ug4) max

    500 V

  • L_!g_Q_mag |

    550 V

  • 1. Generalities Ug2 min

    350 V

  • HQ?_mI-_n

    470 ohm

  • Bulb All-Glass Type Ugl P max

    2 V

  • Base ~ German Standard {(-Ug1) max

    150 V

  • R51 min gi]

    150 ohm

  • Pim max

    10 mW/cm

  • Horizontal 99 U-Fj'lk max 1 @ @

    410 V

  • U - 'k max 2 @ @

    200 V

  • Neck Diameter

    28.6 mm

  • Neck Diameter 28,6 mm U_ ik p max (2)

    300 V

  • U+l."kpmux

    180 V

  • (Light Transmission Rilic max @

    1 MQ

  • Published value

    0.1 MQ

CircuitDesignRatings

  • Fluorescence Colour White = .. g2 . <+

    5 uA

  • Colour Temperature 12

    0 °K

  • Colour Temperature 12 000 °K {approx.) loa < + (2)

    25 uA

  • Minimum Useful 384 x

    305 mm

  • Minimum Useful 384 x 305 mm Rulen’ > (2)

    2 MQ

  • Dimensions Diagonal

    446 mm

Capacitance

  • Overall Length 302,5 +

    6.5 mm

  • Weight

    8 kg

  • Weight 8 kg (approx.) Cq] __ ] approx. (2)

    6 pF

  • Ck. approx.

    5 pF

  • Implosion protection by steel reinforcement. Cg3g

    5 a

  • Implosion protection by steel reinforcement. Cg3g5a/m max (2)

    1500 pF

  • Admitted by Association of German Elec- CadgSa/m min

    1000 pF

  • trical Engineers, VDE. Cg3g5al/m’ approx.

    350 pF

  • A

    4727 W