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8HP4

Eight-inch P4 cathode-ray display tube for high-voltage direct visual service, using magnetic deflection and manufacturer-specified focusing, grid-control, and accelerating-voltage characteristics.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 12L
Socket code: DUODECAL5
Base pins: 6
Nominal heater: 6.3 V / 600 mA

Description

Rectangular aluminized P4 monitor kinescope with low-voltage electrostatic focus, 90-degree magnetic deflection, and no ion-trap magnet requirement.

Socket description

Small-shell Duodecal 5-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12L
Socket code: DUODECAL5
Base pins: 6
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12L - 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.

Cathode-ray section. CRT anode/ultor, grid, focus/deflection, heater-cathode, capacitance, and operating values are stored as 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

Capacitance

Cathode to All Other Electrodes Capacitance
5 pF
Grid #1 to All Other Electrodes Capacitance
9 pF
External Conductive Coating to Anode Capacitance
250 to 350 pF

Characteristics

Focusing Method
Electrostatic
Deflecting Method
Magnetic

Other

Anode Voltage
- to 14000 V
Absolute maximum
Grid #4 Focusing Voltage - Positive
- to 1100 V
Absolute maximum
Grid #4 Focusing Voltage - Negative
- to 550 V
Absolute maximum
Grid #2 Voltage
- to 550 V
Absolute maximum
Grid #1 Negative Peak Voltage
- to 220 V
Grid #1 Negative Bias Voltage
- to 155 V
Grid #1 Positive Bias Voltage
- to 0 V
Grid #1 Positive Peak Voltage
- to 2 V
Heater Voltage
5.7 to 6.9 V
Peak Heater-Cathode Voltage - Heater Negative
- to 180 V
Peak Heater-Cathode Voltage - Heater Positive
- to 180 V
Anode Voltage
11000 V
GridDrive
Grid #4 Voltage
0 to 300 V
GridDrive
Grid #2 Voltage
300 V
GridDrive
Grid #1 Voltage for Visual Extinction
-72 to -28 V
GridDrive
Grid #1 Circuit Resistance
- to 1.5 MΩ
Maximum circuit value