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C12A

Brimar magnetic television picture tube for domestic direct-view service. The family uses magnetic beam control with an aluminized display screen; selected variants add a tetrode gun, ion trap, and conductive coating.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: IO
Base pins: -
Nominal heater: 2 V / 1.4 A

Description

High-voltage cathode-ray tube for domestic television with magnetic focus and deflection.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: -
Nominal heater voltage: 2 V
Nominal heater current: 1.4 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 plate voltage: 6000 V

Television cathode-ray display section.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
Magnetic
Deflection method
Magnetic

Application

Application
Domestic television picture tube

Other

Typical anode voltage
5500 V

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum Final Anode Voltage
6000 V
Typical Final Anode Voltage
5500 V
Maximum Beam Current
0.15 mA