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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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21EMP4 vacuum tube outline illustration

Tube-number record

21EMP4

0 archive entries

21EMP4 is a tube type in the TubeDatabase archive (class: Television Picture Tube). Recorded specifications: brand Westinghouse, year 1958, construction Rectangular Glass, socket CRT base (B7 family), and maximum plate voltage 18000 V. The archive does not yet hold a photographed example of this type.

BrandWestinghouse
ClassTelevision Picture Tube
BaseCRT base (B7 family)
Filament6.3 V @ 600 mA

Construction

Primary TypeRectangular Glass
EnvelopeGlass
Sections1

Filament / Heater

Heater Notesac or dc

Absolute Maximum Ratings

Plate Voltage18000 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Operating Conditions16000 V————

Application Notes

Shielding for x-ray radiation may be needed when operating conditions involve voltages in excess of 16 kilovolts. Operation with anode voltage less than 11000 volts is not recommended. Protective resistance in grid 4 and grid 2 circuits is advisable.

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    Grid 2 Voltage500 V
    H-C Voltage180 V

    Audio Performance

    Key Features
    • 110° Magnetic Deflection
    • Aluminized
    • No Ion Trap
    • Low Voltage Electrostatic Focusing
    • External Conductive Coating
    • Neutral Gray Glass