Tube-number record
T986D, T986Y, T986Z
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BrandEnglish Electric Valve Co. Ltd.
ClassRadar P.P.I. Display Tube
BaseCRT base (B8H)
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialPlastic/Metal
SectionsSingle
Filament / Heater
Heater NotesSuitable for series or parallel operation. Surge voltage must not exceed 9.5 V.
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage800 V
Grid 1 Voltage200 V
H-C Voltage250 V
Audio Performance
Key Features
- Aluminised Screen
- High Brightness
- Narrow scan angle
- Transistor compatible scan
- X-ray shielded requirement
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| P.P.I. Display | 14000 V | — | — | — | 0.015 mA |
Application Notes
Intended primarily for marine radar P.P.I. displays. Requires cavity cap B.S.448-CT8 for Anode 2 and Anode 4 connections.
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