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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

31-120 W

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BrandITT Components Group Europe
ClassBlack and White Picture Tube

Construction

Primary TypeOther / special
EnvelopeGlass

Filament / Heater

Heater NotesIndirectly heated; both alternating current and direct current may be used, with parallel or series connection.

Absolute Maximum Ratings

Audio Performance

Key Features
  • SELBOND® implosion protection
  • Aluminium coating
  • External graphite coating
  • Oxide-coated cathode

Application Notes

The undeflected spot disappears by making the control grid voltage approximately 5V more negative than the raster cutoff voltage.

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