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T986Y

Twelve-inch high-brightness marine-radar PPI CRT with magnetic deflection, electrostatic focusing, aluminized persistent screen, narrow 40-degree scan angle, and typical EHT around 12–16 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: BS8H
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 340 mA

Description

Twelve-inch high-brightness marine-radar PPI cathode-ray tube with magnetic deflection, electrostatic focus, aluminized screen, narrow 40-degree scan angle, and 12–16 kV typical EHT. Y screen

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: BS8H
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 340 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

BS8H - 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.

Maximum final-anode/PDA voltage mapped to MaxPlateVoltage.

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 English Electric Valve

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
6.3 V
Heater current
340 mA
Minimum anode 2/anode 4 voltage
8 kV
Maximum anode 2/anode 4 voltage
18 kV
Maximum anode 1 voltage
800 V
Typical anode 2/anode 4 voltage range
12-16 kV
Deflection angle
40 deg
X-ray production threshold
16 kV

Characteristic

Screen characteristic
Y screen

Capacitance

Grid to all other electrodes capacitance
80 pF
Cathode to all other electrodes capacitance
80 pF
Anode 2/anode 4 to external conductive coating capacitance
1500 pF