A47-11W
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BrandMullard
ClassCathode Ray Tube
BaseB8H
Filament6.3V @ 300mA
Construction
Primary TypeDirect viewing television tube
EnvelopeReinforced glass
Base MaterialGlass with pin protector
SectionsSingle
Filament / Heater
Heater NotesSuitable for series or parallel operation. Surge heater voltage must not exceed 9.5V r.m.s. for series operation.
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage700 V
Grid 1 Voltage-400 V
H-C Voltage250 V
Audio Performance
Key Features
- Metal backed screen
- Reinforced envelope
- No separate safety screen required
- Electrostatic focusing
- Magnetic deflection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid Modulation (Va1=400V) | 20000V | - | - | - | 0.25mA |
| Grid Modulation (Va1=500V) | 20000V | - | - | - | 0.25mA |
| Cathode Modulation (Va1=400V) | 20000V | - | - | - | 0.25mA |
Application Notes
The metal band (B) must be connected to the chassis via a 2M Ohm resistor. X-ray shielding is advisable if operated above 20kV. External conductive coating M must be earthed.
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