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8B08VB

High-resolution 8.5-inch rectangular radar display CRT with magnetic focusing and deflection and a metal-backed screen for detailed radar presentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: B12A
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

High-resolution 8.5-inch rectangular radar display CRT with magnetic focus and deflection and metal-backed screen.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B12A
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B12A - 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: 15000 V

Promoted fields were populated only where the Ferranti sheet maps cleanly to the locked schema; additional ratings and operating values are retained in TUBE_SECTION_PARAMETER.

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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

First-anode voltage maximum
600 V
Second-anode voltage minimum
9000 V
First-anode voltage
300 V
Second-anode voltage
15000 V
Visual cutoff grid voltage minimum
-90 V
Visual cutoff grid voltage maximum
-30 V
Average modulation drive for 50uA beam current
20 V

Capacitance

Cathode-to-all capacitance maximum
8 pF
Grid-to-all capacitance maximum
8 pF