Tube-number record
21FVP4
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BrandRCA
ClassPicture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 450 mA
Construction
Primary TypeDisplay / CRT
EnvelopeJ165-1/4 A
Sections1
Filament / Heater
Heater NotesHeater warm-up time is approximately 11 seconds (inferred from typical specs for this series, though OCR text is unclear).
Absolute Maximum Ratings
Plate Voltage23000 V
Grid 2 Voltage550 V
Grid 1 Voltage-155 V
H-C Voltage200 V
Audio Performance
Key Features
- PAN-O-PLY Integral Implosion Protection
- No Ion-Trap Magnet Required
- Low-Voltage Electrostatic Focus
- Magnetic Deflection
- Aluminized Phosphor
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode-Drive Service | 20000 V | — | — | — | — |
Application Notes
The grid-No.4 voltage required for optimum focus will have a value between -100 and +300 volts.