Tube-number record
9/25AM
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BrandFerranti
ClassHigh Resolution Display Tube
BaseDuodecal
Filament6.3 V @ 300 mA
Construction
Primary TypeDisplay / CRT
Envelope9 inch diameter optically flat face
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage30000 V
H-C Voltage200 V
Audio Performance
Key Features
- Optically flat face
- Metal-backed screen
- High resolution
- Internal and external ground surfaces
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 20000 V | — | — | — | — |
Application Notes
X-ray warning: Shielding may be required if anode voltage exceeds 16 kV.
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