Tube-number record
21FBP22
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BrandRCA
ClassColor Picture Tube
BaseCRT base (B12 family)
Filament6.3 V @ 1800 mA
Construction
Primary TypeOther / special
EnvelopeAll-Glass
Base MaterialSmall-Shell Neodiheptal
Sections3
Filament / Heater
Heater NotesParalleled heaters within tube; Current measured at 6.3V
Absolute Maximum Ratings
Plate Voltage27500 V
Grid 2 Voltage650 V
Grid 1 Voltage-400 V
H-C Voltage200 V
Audio Performance
Key Features
- Aluminized Tricolor Phosphor-Dot Screen
- P22-Al-Sulfide Type Phosphor
- Spherical Filterglass Faceplate
- Magnetic Convergence
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Example at 20000V Ultor | 20000 V | — | — | — | — |
| Example at 25000V Ultor | 25000 V | — | — | — | — |
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