3FP7-A
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BrandRCA
ClassCathode-Ray Tube
BaseMedium Shell Diheptal 12-Pin
Filament6.3V @ 0.6mA
Construction
Primary TypeElectrostatic Focus and Deflection
EnvelopeGlass
Base MaterialPlastic
SectionsSingle gun
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage4400 V
Grid 2 Voltage2200 V
Grid 1 Voltage-200 V
H-C Voltage125 V
Audio Performance
Key Features
- Electrostatic Focus
- Electrostatic Deflection
- Long-persistence phosphorescence
- Improved electron gun
- Supplements RCA-3FP7
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Low Accelerating Voltage | 2000V | - | - | - | - |
| High Definition Scan | 3000V | - | - | - | - |
| High Brightness | 4000V | - | - | - | - |
Application Notes
Recommended for oscillographic applications where long persistence is required. The yellow pattern remains visible for several minutes. Use Wratten No. 15 filter to isolate yellow persistence or Wratten No. 47A for blue short-persistence.
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