Tube-number record
21DKP4A
0 archive entries
21DKP4A is a tube type in the TubeDatabase archive (class: Television Picture Tube). Recorded specifications: brand Westinghouse, year 1959, construction Rectangular Glass, base Plastic/Glass, socket Miniature 7-pin (B7G), and maximum plate voltage 18000 V. The archive does not yet hold a photographed example of this type.
BrandWestinghouse
ClassTelevision Picture Tube
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 300 mA
Construction
Primary TypeRectangular Glass
EnvelopeGlass
Base MaterialPlastic/Glass
SectionsSingle
Filament / Heater
MaterialCoated Unipotential
Warm-up Time11s
Heater NotesControlled Warm-up Heater
Absolute Maximum Ratings
Plate Voltage18000 V
Grid 2 Voltage500 V
Grid 1 Voltage-140 V
H-C Voltage180 V
Audio Performance
Key Features
- Light Weight Bulb
- External Conductive Coating
- Spherical Faceplate
- No Ion Trap
- Neutral Gray Glass
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical | 16000 V | — | — | — | — |
Application Notes
Operation with anode voltage less than 12000 volts is not recommended. X-ray shielding may be needed for voltages in excess of 16 kilovolts.
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