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

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
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Tube-number record

5/28AM

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BrandFerranti
ClassUltra High Resolution Display Tube
BaseDuodecal
Filament6.3 V @ 300 mA

Construction

Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage25000 V
H-C Voltage200 V

Audio Performance

Key Features
  • Optically flat face
  • Ground internal and external surfaces
  • Metal-backed screens
  • Fine particle size
  • Magnetic focus
  • Magnetic deflection

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Anode Voltage Operation15000 V————

Application Notes

X-RAY WARNING: When operated at an anode voltage in excess of 16 kV, shielding may be required to protect against harmful X-ray radiation.

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