Tube-number record
21FDP4
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BrandRCA
ClassPicture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesControlled Warm-Up Time
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage550 V
Grid 1 Voltage-155 V
H-C Voltage200 V
Audio Performance
Key Features
- Aluminized Screen
- Short Rectangular Glass Type
- No Ion-Trap Magnet Required
- Filterglass Faceplate
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard | 16000 V | — | — | — | — |
Application Notes
Heater-cathode voltage max 450V during 15s warm-up; 200V thereafter.
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