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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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308 vacuum tube outline illustration

Tube-number record

308

0 archive entries

308 is a tube type in the TubeDatabase archive (class: Diode-Pentode). Recorded specifications: construction Multi-section, socket Loctal, and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.

ClassDiode-Pentode
BaseLoctal

Construction

Primary TypeMulti-section
EnvelopeGlass
SectionsDual (Diode + Pentode)

Filament / Heater

Absolute Maximum Ratings

Plate Voltage90 V
Grid 2 Voltage90 V

Audio Performance

Key Features
  • Battery-operated
  • Loctal base

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode Section90 V575700000—1.2 mA

Application Notes

Commonly used in portable battery-operated radio receivers as a combined detector, AVC, and audio amplifier.

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