Tube-number record
908A
0 archive entries
908A is a tube type in the TubeDatabase archive (class: Oscillograph Tube). Recorded specifications: brand RCA, year 1946, construction Display / CRT, base Plastic, socket 7-pin (non-miniature), and maximum plate voltage 1500 V. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassOscillograph Tube
Base7-pin (non-miniature)
Filament2.5 V @ 2100 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialPlastic
SectionsSingle
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage1500 V
Grid 2 Voltage1500 V
Grid 1 Voltage-125 V
Audio Performance
Key Features
- Electrostatic Focus
- Electrostatic Deflection
- Blue Fluorescence
- Short Persistence Phosphor
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation at 1000V Anode 2 | 1000 V | — | — | — | — |
| Operation at 1500V Anode 2 | 1500 V | — | — | — | — |
Application Notes
Brilliance and definition decrease with decreasing Anode No. 2 voltage; should not be less than 1000 volts.
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