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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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Tube-number record

8489

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BrandTUNG-SOL
ClassTriode-Pentode
BaseNoval (B9A)
Filament6.3 V @ 450 mA

Construction

Primary TypeMulti-section
EnvelopeT-6 1/2
Base MaterialGlass
Sections2

Filament / Heater

Heater NotesCoated unipotential cathodes

Absolute Maximum Ratings

Plate Voltage330 V
Plate Dissipation2.8 W
Grid 2 Voltage330 V
H-C Voltage200 V

Audio Performance

Key Features
  • Medium Mu Triode
  • Sharp Cutoff Pentode
  • Low Leakage Materials
  • Intended for high control grid resistance circuits

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Triode Section150 V450047002115 mA
Pentode Section125 V7000170000—12 mA

Application Notes

Leakage is minimized by use of special materials and processing; maintenance of characteristics is assured by special life tests.

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