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Specialized - Cathode Ray ·CathodeRay

TH8902

Thomson-CSF storage tube designed for electronic recording, retention, and readout of electrical information. Family variants emphasize transient capture, high-resolution storage, scan conversion, rugged miniature operation, or bright direct viewing.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B14F
Base pins
-
Nominal heater
-

Description

The TH8902 is a direct-view storage cathode-ray tube providing a bright stored display for electronic instrumentation and related display applications.

Socket description

All-glass CRT 14-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B14F
Base pins
-
Nominal heater voltage
-
Nominal heater current
-
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.

Published ratings/characteristics audited; detailed numeric data retained in parameter table.

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

1972 Thomson CSF

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Luminance®

    400

    Luminance® . ... 400 cd.m?

  • Heater voltage (D.C.)

    6.3 V

    Heater voltage (D.C.) . . . . ... . 6.3V

  • Heater current . . . . . . e, [1]

    2 A

    Heater current . . . . . . e, 2x0.3 A

  • Heater current . . . . . . e, [2]

    3 A

    Heater current . . . . . . e, 2x0.3 A

  • Heatervoltage . .. .. ... .. .. i e

    6.3 V

    Heatervoltage . .. .. ... .. .. i e 6.3V

  • Heater current . . . . . .,

    600 mA

    Heater current . . . . . ., 0.6 A

  • Heater h' voltage (D.C.) [1]

    5.7 V

    Heater h' voltage (D.C.) . . . .. .. . ... 5.7t06.9 \)

  • Heater h' voltage (D.C.) [2]

    6.9 V

    Heater h' voltage (D.C.) . . . .. .. . ... 5.7t06.9 \)

  • Cathode k'and kgrvoltages . ... ... ... ... ... ... ... ... ... ......... max

    50 V

    Cathode k'and kgrvoltages . ... ... ... ... ... ... ... ... ... ......... max. 50 \

  • heater negative with respect to cathode . . . ... ..... ... ... ........ max

    150

    heater negative with respect to cathode . . . ... ..... ... ... ........ max. 150 \'%

  • heater positive with respect to cathode . . .. . .. ... .. ... max

    150

    - heater positive with respect to cathode . . .. . .. ... .. ... max. 150 \

  • Grid gq- voltage (contral grid) . . ... ... ... L —

    200 V

    Grid gq- voltage (contral grid) . . ... ... ... L — 200 \Y

  • Grid go- voltage (accelerating electrode) . ... ... ... ... ...... .. ... .. .. .. — [1]

    50 V

    Grid go- voltage (accelerating electrode) . ... ... ... ... ...... .. ... .. .. .. — 50 to +50 \

  • Grid go- voltage (accelerating electrode) . ... ... ... ... ...... .. ... .. .. .. — [2]

    50 V

    Grid go- voltage (accelerating electrode) . ... ... ... ... ...... .. ... .. .. .. — 50 to +50 \

  • Grid g3’ voltage (collimating electrode} . .. ... .. .. ... ... ... ...... ... max

    100 V

    Grid g3’ voltage (collimating electrode} . .. ... .. .. ... ... ... ...... ... max. 100 \)

  • Grid gg' voltage (collecting electrode} *. .. ... ...... ... ... ... ... ... . ... max

    150 V

    Grid gg' voltage (collecting electrode} *. .. ... ...... ... ... ... ... ... . ... max. 150 \Y;

  • Grid gg' voltage (backing electrode) .. ... ... ... . ..... .. ... ... .. .. — [1]

    150 V

    Grid gg' voltage (backing electrode) .. ... ... ... . ..... .. ... ... .. .. — 150 to + 1600 \Y

  • Grid gg' voltage (backing electrode) .. ... ... ... . ..... .. ... ... .. .. — [2]

    1600 V

    Grid gg' voltage (backing electrode) .. ... ... ... . ..... .. ... ... .. .. — 150 to + 1600 \Y

  • Viewing screengy-voltage . .. ... ... ... ... ... ... ... max

    8 V

    Viewing screengy-voltage . .. ... ... ... ... ... ... ... max. 8 kV

  • Heater hvoltage [1]

    5.7 V

    Heater hvoltage . . . . . . . . . ... 5.7t06.9 \Y

  • Heater hvoltage [2]

    6.9 V

    Heater hvoltage . . . . . . . . . ... 5.7t06.9 \Y

  • Cathodevoltage . ... ... . . . . . ... max

    3.6 V

    Cathodevoltage . ... ... . . . . . ... max. - 3.6 kV

  • heater positive with respect to cathode . . . .. ... ... ... ... ... ..., max

    150

    heater positive with respect to cathode . . . .. ... ... ... ... ... ..., max. 150 \Y

  • Grid gq voltage™™ (control grid) . ... ... ... ... . ... ... —

    300 V

    Grid gq voltage™™ (control grid) . ... ... ... ... . ... ... — 300 \Y

  • Grid gp voltage (acceleratingvoltage) ... ........................... max

    50 V

    Grid gp voltage (acceleratingvoltage) ... ........................... max. 50 \Y;

  • Grid g3 voltage (focusing electrode) ... . ... ... ... ... ... . ... ... max

    -3 V

    Grid g3 voltage (focusing electrode) ... . ... ... ... ... ... . ... ... max. -3 kV

  • Grid g4 voltage (astigmatism) . ... ... ... ........ . ... ... max

    100 V

    Grid g4 voltage (astigmatism) . ... ... ... ........ . ... ... max. 100 \Y;

  • Grid g5 voltage (geometry) .. ... max

    100 V

    Grid g5 voltage (geometry) .. ... max. 100 Vv

  • Heater h' voltage (D.C.) [1]

    6.3 V

    Heater h' voltage (D.C.) .. 6.3+10% \Y

  • Heater h' voltage (D.C.) [2]

    10 V

    Heater h' voltage (D.C.) .. 6.3+10% \Y

  • Cathode kq-voltage (Note [1]

    1 V

    Cathode kq-voltage (Note 1) ... .. ... .. ... ... . ... ... ... . ... ... .. Oto +3 \

  • Cathode kq-voltage (Note [2]

    3 V

    Cathode kq-voltage (Note 1) ... .. ... .. ... ... . ... ... ... . ... ... .. Oto +3 \

  • Cathode kogrvoltage (Note [1]

    1 V

    Cathode kogrvoltage (Note 1) ... .. ... ... ... .. ... . ... .. ... ...... .. Oto +3 \Y;

  • Cathode kogrvoltage (Note [2]

    3 V

    Cathode kogrvoltage (Note 1) ... .. ... ... ... .. ... . ... .. ... ...... .. Oto +3 \Y;

  • Grid gqr voltage (controt grid)

    0 V

    Grid gqr voltage (controt grid) ... .. ... ... ... .. 0 \Y

  • Grid g3 voltage (collimating electrode) (Note [1]

    2 V

    Grid g3 voltage (collimating electrode) (Note 2} ... ..................... .. 30to 70 \Y

  • Grid g3 voltage (collimating electrode) (Note [2]

    30 V

    Grid g3 voltage (collimating electrode) (Note 2} ... ..................... .. 30to 70 \Y

  • Grid g3 voltage (collimating electrode) (Note [3]

    70 V

    Grid g3 voltage (collimating electrode) (Note 2} ... ..................... .. 30to 70 \Y

  • Viewing screen g7+ voltage (Note

    8 V

    Viewing screen g7+ voltage (Note 8} .. ... .. ... . ... ... . ... . ... ..., .. see table below

  • Heater hvoltage [1]

    6.3 V

    Heater hvoltage . ... . ... . . . ... 6.3£10% \

  • Heater hvoltage [2]

    10 V

    Heater hvoltage . ... . ... . . . ... 6.3£10% \

  • Cathode k voltage (Note [1]

    14 V

    Cathode k voltage (Note 14) . . . — 1700 \

  • Cathode k voltage (Note [2]

    1700 V

    Cathode k voltage (Note 14) . . . — 1700 \

  • Grid gq voltage (for cut-off) (w.rt. Vi) ..o o L — [1]

    100 V

    Grid gq voltage (for cut-off) (w.rt. Vi) ..o o L — 100 to — 40 \%

  • Grid gq voltage (for cut-off) (w.rt. Vi) ..o o L — [2]

    40 V

    Grid gq voltage (for cut-off) (w.rt. Vi) ..o o L — 100 to — 40 \%

  • Grid gg voltage (acceleration)

    40 V

    Grid gg voltage (acceleration) .. ... .. ... 40 \Y;

  • Grid gz voltage (focus) [1]

    -1400 V

    Grid gz voltage (focus) . . ... ..... ... ... . .. ... .. ... ... . —1400 to —1000 A

  • Grid gz voltage (focus) [2]

    -1000 V

    Grid gz voltage (focus) . . ... ..... ... ... . .. ... .. ... ... . —1400 to —1000 A

  • Grid gq voltage (astigmatism} [1]

    10 V

    Grid gq voltage (astigmatism} . ... ... ... ... .. ... 10to 70 \Y,

  • Grid gq voltage (astigmatism} [2]

    70 V

    Grid gq voltage (astigmatism} . ... ... ... ... .. ... 10to 70 \Y,

  • Grid gg voltage (geometry) {w.r.t. x plates mean potential) [1]

    -30 V

    Grid gg voltage (geometry) {w.r.t. x plates mean potential) .. ... ... ... ..... ... —30to +30 \'

  • Grid gg voltage (geometry) {w.r.t. x plates mean potential) [2]

    30 V

    Grid gg voltage (geometry) {w.r.t. x plates mean potential) .. ... ... ... ..... ... —30to +30 \'

  • heater current (D.C.YatVyr = [1]

    6.3 A

    heater current (D.C.YatVyr = 6.3V .. .. .. ... .. . 0. 66 A

  • heater current (D.C.YatVyr = [2]

    0 mA

    heater current (D.C.YatVyr = 6.3V .. .. .. ... .. . 0. 66 A

  • heater current (D.C.YatVyr = [3]

    66 A

    heater current (D.C.YatVyr = 6.3V .. .. .. ... .. . 0. 66 A

  • cathode kqrcurrent

    1.5 A

    cathode kqrcurrent . .. .. .. ... .. 1.5 mA

  • cathode korcurrent . .. . ... L

    1.5 A

    cathode korcurrent . .. . ... L. 1.5 mA

  • gridggr current

    1 A

    gridggr current ... 1 mA

  • Sogridggrourrent L

    2

    Sogridggrourrent L. 2 mA

  • grid gg CUITENT

    0.5

    grid gg CUITENT . . . . .. 0.5 mA

  • grid ggr CUTTENT . . . L

    0.5

    grid ggr CUTTENT . . . L. 0.5 mA

  • grid g7/ CUITENt

    0.2

    grid g7/ CUITENt . . . ... 0.2 mA

  • heater currentat Vi), = [1]

    6.3 A

    heater currentat Vi), = 6.3V ... ... .. L 0. 66 mA

  • heater currentat Vi), = [2]

    0 mA

    heater currentat Vi), = 6.3V ... ... .. L 0. 66 mA

  • heater currentat Vi), = [3]

    66 A

    heater currentat Vi), = 6.3V ... ... .. L 0. 66 mA

  • cathode CUITeNt . . . . . . . . e e e

    3.5

    cathode CUITeNt . . . . . . . . e e e 3.5 mA

  • grid go CUFTENt . . . .. e

    3

    grid go CUFTENt . . . .. e 3 mA

  • Published value

    1

    1 - A high permeability shield (mumetal) is necessary to protect the tube against external electrostatic and

  • Published value [1]

    2

    2 - For the writing gun, a heater transformer with insulated secondary coil must be used (4 kV insulation

  • Published value [2]

    4

    2 - For the writing gun, a heater transformer with insulated secondary coil must be used (4 kV insulation

  • Resolution (NOte [1]

    9

    Resolution (NOte 9) . . . . .. .. . e e 0.4 mm

  • Resolution (NOte [2]

    0.4

    Resolution (NOte 9) . . . . .. .. . e e 0.4 mm

  • The luminance for a saturated written trace is over [1]

    400

    The luminance for a saturated written trace is over 400 cd.m-2.

  • The luminance for a saturated written trace is over [2]

    2

    The luminance for a saturated written trace is over 400 cd.m-2.

  • When the flood beams are cut off and the screen voltage at

    0 V

    When the flood beams are cut off and the screen voltage at 0 V potential, the written information is not degraded

  • In the long-storage mode, g2' voltage is set at [1]

    -6 V

    In the long-storage mode, g2' voltage is set at —6 V, then a positive pulse train of 26 to 46 V amplitude is applied.

  • In the long-storage mode, g2' voltage is set at [2]

    26 V

    In the long-storage mode, g2' voltage is set at —6 V, then a positive pulse train of 26 to 46 V amplitude is applied.

  • In the long-storage mode, g2' voltage is set at [3]

    46 V

    In the long-storage mode, g2' voltage is set at —6 V, then a positive pulse train of 26 to 46 V amplitude is applied.

  • In store mode, the g6’ voltage must never exceed

    8 V

    In store mode, the g6’ voltage must never exceed 8 V. The impedance of the g6’ circuit must be as low as possible and not exceed

  • {n variable persistence mode, a positive pulse train of

    4

    {n variable persistence mode, a positive pulse train of 4 V amplitude is applied to grid g6’.

  • In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e [1]

    1

    In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e. 1 to 3 V) to ‘+ 1500 V for about 1 second and

  • In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e [2]

    3

    In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e. 1 to 3 V) to ‘+ 1500 V for about 1 second and

  • In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e [3]

    1500

    In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e. 1 to 3 V) to ‘+ 1500 V for about 1 second and

  • In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e [4]

    1

    In erase mode, the grid g6’ potential must be raised from store-mode potential {i.e. 1 to 3 V) to ‘+ 1500 V for about 1 second and

  • then be returned to its store-mode potential. A positive pulse of [1]

    12

    then be returned to its store-mode potential. A positive pulse of 12 V amplitude maximum is then applied for 500 milliseconds.

  • then be returned to its store-mode potential. A positive pulse of [2]

    500

    then be returned to its store-mode potential. A positive pulse of 12 V amplitude maximum is then applied for 500 milliseconds.

  • In changing the operating from the “‘non-store” to the ‘‘store’” mode, the g6’ voltage must be raised from

    -30 V

    In changing the operating from the “‘non-store” to the ‘‘store’” mode, the g6’ voltage must be raised from —30 V to the proper

  • positive voltage ( [1]

    1 V

    positive voltage (1 to 3 V] in 2 seconds. This will prevent the storage surface to be damaged.

  • positive voltage ( [2]

    3 V

    positive voltage (1 to 3 V] in 2 seconds. This will prevent the storage surface to be damaged.

  • positive voltage ( [3]

    2 V

    positive voltage (1 to 3 V] in 2 seconds. This will prevent the storage surface to be damaged.

  • To avoid permanent damage to the tube, insert a [1]

    30

    To avoid permanent damage to the tube, insert a 30 M§2 minimum resistance in series in the supply circuit of g7’ screen.

  • To avoid permanent damage to the tube, insert a [2]

    2

    To avoid permanent damage to the tube, insert a 30 M§2 minimum resistance in series in the supply circuit of g7’ screen.

  • Measurement is made by the shrinking raster method with a beam current of [1]

    5 A

    Measurement is made by the shrinking raster method with a beam current of 5 UA. The linewidth is 0.4 mm max. at center and

  • Measurement is made by the shrinking raster method with a beam current of [2]

    400 mA

    Measurement is made by the shrinking raster method with a beam current of 5 UA. The linewidth is 0.4 mm max. at center and

  • In addition, this limiting writing speed can be further multiplied by a factor of [1]

    2 V

    In addition, this limiting writing speed can be further multiplied by a factor of 2 or 3 by doubling the acceleration voltage of the

  • In addition, this limiting writing speed can be further multiplied by a factor of [2]

    3 V

    In addition, this limiting writing speed can be further multiplied by a factor of 2 or 3 by doubling the acceleration voltage of the