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8AP4A

Eight-inch direct-view television picture tube with magnetic focusing and magnetic deflection, intended for compact monochrome television receiver applications.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 12H
Socket code: OCTALCRT8
Base pins: 5
Nominal heater: 6.3 V / 600 mA

Description

Magnetic-focus and magnetic-deflection direct-view cathode-ray picture tube for television applications.

Socket description

Octal 8-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12H
Socket code: OCTALCRT8
Base pins: 5
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12H - 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: 9000 V
Rectifier max heater-cathode voltage: 140 V

Picture-tube anode-voltage maximum promoted; heater-cathode limits and operating data retained in 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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

HeaterOrFilamentVoltageNominal
6.3 V
HeaterOrFilamentCurrentNominal
600 mA
Maximum Anode Voltage
9000 V
RecommendedAnodeVoltage
7000 V
AverageBrightness=20foot-lamberts
Grid1VoltageMinimum
-63 V
Grid1VoltageMaximum
-27 V
PeakHeaterCathodeVoltageWarmup
410 V
HeaterNegative;Warmup<=15s
Peak Heater Cathode Voltage
140 V
AfterWarmup