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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

B329/12AU7

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B329/12AU7 is a tube type in the TubeDatabase archive (class: Double Triode). Recorded specifications: brand Marconi, year 1955, construction Dual triode, socket Noval (B9A), and maximum plate voltage 300 V. The archive does not yet hold a photographed example of this type.

BrandMarconi
ClassDouble Triode
BaseNoval (B9A)
Filament
6.3 V @ 0.3 mA

Construction

Primary TypeDual triode
EnvelopeTubular
Sections2

Filament / Heater

Heater Notes12-6V Indirectly Heated

Absolute Maximum Ratings

Plate Voltage300 V
Cathode Current20 mA
H-C Voltage180 V

Audio Performance

Key Features
  • Indirectly Heated
  • Commercial equivalent of CV491

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Characteristics (Per Section)250 V220077001710.5 mA
Typical Operation (Voltage Amp)250 V—100000——

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