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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

9/28PM

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BrandFerranti
ClassCathode Ray Tube
BaseDuodecal
Filament6.3 V @ 300 mA

Construction

Primary TypeDisplay / CRT
Envelope9 inch diameter optically flat face with ground internal and external surfaces
SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage30000 V
H-C Voltage200 V

Audio Performance

Key Features
  • Optically flat face
  • High resolution
  • Magnetic focus
  • Magnetic deflection

Typical Operation

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

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