Tube-number record
21DMP4
0 archive entries
21DMP4 is a tube type in the TubeDatabase archive (class: Television Picture Tube). Recorded specifications: brand National Video Corporation, year 1958, construction Display / CRT, base Plastic, socket CRT base (B7 family), and maximum plate voltage 20000 V. The archive does not yet hold a photographed example of this type.
BrandNational Video Corporation
ClassTelevision Picture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeJ171G1
Base MaterialPlastic
Sections1
Filament / Heater
Heater Notes0.6 Amperes +/- 5%
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Direct View Television | 16000 V | — | — | — | 0.1 mA |
Application Notes
X-ray radiation shielding may be necessary for operation at voltages higher than 16,000 volts. Focus voltage varies between -50V to +350V under typical conditions.
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