30B1
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BrandEdiswan
ClassCathode Ray Tube
Base12-contact key base (BS.448)
Filament4V @ 720mA
Construction
Primary TypeAll Electrostatic CRT
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage6000 V
Grid 2 Voltage1000 V
Grid 1 Voltage2500 V
Audio Performance
Key Features
- Polished flat face
- High grade precision measurement
- Medium persistence green phosphor (P1)
- Bulb coating brought out separately
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Va3=2000V Operation | 2000V | - | - | - | 0.02mA |
| Va3=3000V Operation | 3000V | - | - | - | 0.02mA |
| Va3=5000V Operation | 5000V | - | - | - | 0.02mA |
Application Notes
Final Anode and Bulb coating are brought out separately to enable a finer spot or higher writing speed by increasing Final Anode voltage above Anode 1 limit. Normally joined in use.
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