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Specialized - Cathode Ray ·CathodeRay

11HP4A

Eleven-inch P4 cathode-ray picture tube with magnetic deflection for direct-view display. RCA documentation gives high-voltage anode operation around 9 kV and includes the control, focusing, screen-area, and capacitance data needed for receiver design.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
7
Nominal heater
6.9 V / 20 A

Description

11HP4A Picture Tube

The 11HP4A is a PAN-O-PLY type cathode-ray tube designed for television display applications. It features a 110-degree magnetic deflection angle and utilizes low-voltage electrostatic focusing. The tube incorporates an aluminized P4-sulfide type phosphor screen and a filterglass faceplate, and its electron gun is designed to operate without requiring an external ion-trap magnet.

Mechanical Specifications and Optical Characteristics

The 11HP4A is constructed with a J87B glass bulb and includes integrated implosion protection hardware. It has the following physical and optical properties:

  • Weight: Approximately 4 lbs.
  • Overall Length: 8.785 ± 0.250 inches.
  • Neck Length: 4.125 ± 0.125 inches.
  • Screen Dimensions:
    • Projected Area: 60 square inches.
    • Minimum Diagonal: 10.250 inches.
    • Minimum Width: 9.000 inches.
    • Minimum Height: 7.062 inches.
  • Faceplate: Filterglass with an approximate light transmission of 52% at the center.
  • Phosphor: Aluminized P4-Sulfide type.
  • Deflection Angles:
    • Diagonal: 110°
    • Horizontal: 99°
    • Vertical: 82°
  • External Conductive Coating: Regular-band type. The contact area for grounding is located near the reference line, which is determined by a JEDEC No. G-126 gauge. The external conductive coating to anode capacitance is between 500 pF (minimum) and 750 pF (maximum).

Electrical Connections and Pinout

The tube utilizes a JEDEC No. B7-208 Small-Button Neoeightar 7-pin base (Arrangement 1) and a JEDEC No. J1-21 recessed small cavity cap. The terminal connections, viewed from the bottom of the base, are assigned as follows:

Pin / TerminalConnection
Pin 1Heater
Pin 2Grid No. 1
Pin 3Grid No. 2
Pin 4Grid No. 4
Pin 6Grid No. 1
Pin 7Cathode
Pin 8Heater
CapAnode (Grid No. 3, Grid No. 5, Screen, Collector)
CExternal Conductive Coating

The internal structure connects Grid No. 1 to both Pin 2 and Pin 6. The high-voltage anode connection, which includes Grid No. 3, Grid No. 5, the screen, and the collector, is made via the recessed cavity cap.

Heater and Interelectrode Capacitances

The 11HP4A is equipped with an indirectly heated cathode. The heater and direct interelectrode capacitances are characterized by the following values:

  • Heater Voltage (Nominal): 6.3 V
  • Heater Current (at 6.3 V): 450 ± 20 mA
  • Average Heater Warm-Up Time: 11 seconds
  • Cathode to all other electrodes capacitance: 5 pF
  • Grid No. 1 to all other electrodes capacitance: 6 pF

Maximum and Minimum Ratings

The following design-maximum values are established for the 11HP4A, with voltages specified as positive with respect to the cathode unless otherwise noted:

  • Anode Voltage: 9,000 V minimum to 15,000 V maximum
  • Grid-No. 4 (Focusing Electrode) Voltage:
    • Positive value: 1,100 V maximum
    • Negative value: 550 V maximum
  • Grid-No. 2 Voltage: 100 V minimum to 250 V maximum
  • Grid-No. 1 Voltage:
    • Negative peak value: 220 V maximum
    • Negative bias value: 155 V maximum
    • Positive bias value: 0 V maximum
    • Positive peak value: 2 V maximum
  • Heater Voltage: 5.7 V minimum to 6.9 V maximum
  • Peak Heater-Cathode Voltage:
    • Heater negative with respect to cathode:
      • During equipment warm-up period (≤ 15 seconds): 450 V maximum
      • After equipment warm-up period: 300 V maximum
    • Heater positive with respect to cathode:
      • Combined AC & DC voltage: 200 V maximum
      • DC component: 100 V maximum

Typical Operating Conditions

For cathode-drive service, where voltages are specified as positive with respect to Grid No. 1, the typical operating parameters are:

  • Anode Voltage: 11,000 V
  • Grid-No. 4 Voltage: 0 V
  • Grid-No. 2 Voltage: 150 V
  • Cathode Voltage (for visual extinction of focused raster): 31 V to 49 V
  • Maximum Grid-No. 1 Circuit Resistance: 1.5 MΩ

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
7
Nominal heater voltage
6.9 V
Nominal heater current
20 A
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 screen voltage
250 V

CRT-specific ratings, operating conditions, capacitances, focus/deflection, cutoff, optical, and screen data are retained in section 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

Characteristics

  • I 10° MAGNETIC DEFLECTION

    10 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid No.lto all other electrodes

    6 pF

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • External conductive coating to anode — published value 1

    500 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • External conductive coating to anode — published value 2

    750 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Heater Current at G.3 V — published value 1

    450 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Heater Current at G.3 V — published value 2

    20 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Light transmission at center (approx )

    52

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Projected Area of Screen

    60

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Anode Voltage

    9000 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.2 Voltage — published value 1

    100 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.2 Voltage — published value 2

    250 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Heater Voltage — published value 1

    5.7 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Heater Voltage — published value 2

    6.9 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Combined AC & DC voltage

    200 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Anode Voltage — published value 1

    1 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Anode Voltage — published value 2

    1000 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.4 Voltage

    0 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No.2 Voltage

    150 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Cathode Voltage — published value 1

    31 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Cathode Voltage — published value 2

    49 V

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No. l Circuit Resistance — published value 1

    1 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No. l Circuit Resistance — published value 2

    5 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.

  • Grid-No. l Circuit Resistance — published value 3

    1 mA

    Published CRT datasheet value; multiple numbers on one source row represent its separate limits or operating conditions.