Tube-number record
12DP-A
0 archive entries
12DP-A is a tube type in the TubeDatabase archive (class: Cathode-ray Tube). Recorded specifications: construction Display / CRT, base Medium-Shell Octal 8-Pin, socket Octal, and maximum plate voltage 10000 V. The archive does not yet hold a photographed example of this type.
ClassCathode-ray Tube
BaseOctal
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
Base MaterialMedium-Shell Octal 8-Pin
SectionsSingle
Filament / Heater
Heater Notes6.3 Volts, 0.6 Ampere
Absolute Maximum Ratings
Plate Voltage10000 V
Grid 2 Voltage700 V
Grid 1 Voltage-125 V
H-C Voltage125 V
Audio Performance
Key Features
- Magnetically focused
- Magnetically deflected
- Long persistence screen
- 12-inch screen diameter
- P7 Phosphor
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Condition 1 | 4000 V | — | — | — | 0.2 mA |
| Condition 2 | 7000 V | — | — | — | 0.2 mA |
Application Notes
The Type 12DP-A Cathode-ray Tubes are primarily designed for radar indicator applications. Recommended only for replacement purposes. At or near maximum anode ratings, the effective resistance of the anode supply should limit input power to 6 watts.
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