Tube-number record
12BNP4A
0 archive entries
BrandRCA
ClassPicture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 450 mA
Construction
Primary TypeDisplay / CRT
EnvelopeJ99C/E
Sections1
Filament / Heater
Heater NotesHeater Warm-up Time (Average): 11 seconds
Absolute Maximum Ratings
Plate Voltage15000 V
Grid 2 Voltage550 V
Grid 1 Voltage-185 V
H-C Voltage300 V
Audio Performance
Key Features
- Low-voltage electrostatic focus
- No ion-trap magnet required
- 110° Magnetic Deflection
- Aluminized Phosphor
- Filterglass Faceplate
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode-Drive Service | 13000 V | — | — | — | — |
Application Notes
The grid-No.4 voltage required for optimum focus of any individual tube will have a value anywhere between -100 and +300 volts.
0 results