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Specialized - Cathode Ray ·CathodeRay

7TP4

Seven-inch monitor kinescope with electrostatic focusing, magnetic deflection, and a P4 screen. RCA documentation provides accelerating-electrode, control, capacitance, and deflection data with anode capability around 12 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
J1-21
Socket code
DUODECAL11
Base pins
6
Nominal heater
6.3 V / 6 A

Description

7TP4 is a monitor kinescope using electrostatic focusing and magnetic deflection. The source specifies a P4 screen and publishes CRT accelerating-electrode ratings, control/focus electrode limits, heater-cathode limits, capacitances, and operating or deflection characteristics.

Socket description

Duodecal 11-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
J1-21
Socket code
DUODECAL11
Base pins
6
Nominal heater voltage
6.3 V
Nominal heater current
6 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

J1-21 - 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
12000 V

CRT maximum accelerating/anode/ultor voltage is promoted to MaxPlateVoltage; additional electrode ratings, capacitances, operating conditions, deflection/focus and optical data are preserved as parameters.

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

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Maximum grid 3 voltage

    2000 V

  • Maximum grid 2 voltage

    410 V

  • Maximum grid 1 negative-bias voltage

    125 V

    NegativeBias

  • Maximum grid 1 positive-bias voltage

    0 V

    PositiveBias

  • Maximum grid 1 positive-peak voltage

    2 V

    PositivePeak

  • Peak heater-cathode voltage

    410 V

    HeaterNegativeWarmup

  • Peak heater-cathode voltage

    180 V

    HeaterNegativeAfterWarmup

  • Peak heater-cathode voltage

    180 V

    HeaterPositive

  • Maximum accelerating/anode voltage

    12000 V

  • ULTOR' VOLTAGE

    12000 V

    Maximum

  • GRID-No.3 VOLTAGE

    2000 V

    Maximum

  • GRID-No.2 VOLTAGE

    410 V

    Maximum

Capacitance

  • Grid 1 to all other electrodes capacitance

    6 pF

    Approximate

  • Cathode to all other electrodes capacitance

    5 pF

    Approximate

Characteristic

  • Current

    6 A

  • Grid No.l to All Other Electrodes

    6 pF

  • Cathode to All Other Electrodes

    5 pF

  • For ultor voltage o}

    20000 V

  • Ultor Current of 100 µamp

    1160 to 1580 V

  • Focused Spot

    -22 to -52 V

  • Grid-No.l-Circuit Resistance

    1.5 MΩ

    Maximum