Tube-number record
21DFP4
0 archive entries
21DFP4 is a tube type in the TubeDatabase archive (class: Picture Tube). Recorded specifications: brand RCA, year 1957, construction Display / CRT, base Glass, socket 7-pin (non-miniature), and maximum plate voltage 18000 V. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassPicture Tube
Base7-pin (non-miniature)
Filament6.3 V @ 0.6 mA
Construction
Primary TypeDisplay / CRT
EnvelopeRectangular Glass
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage-120 V
H-C Voltage180 V
Audio Performance
Key Features
- Low-Voltage Electrostatic Focus
- 110° Magnetic Deflection
- Aluminized Screen
- Very Short Rectangular Glass Type
- No Ion-Trap Magnet
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid-Drive Service | 14000 V | — | — | — | — |
| Cathode-Drive Service | 16000 V | — | — | — | — |
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