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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

B339/12AX7

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BrandMarconi
ClassHigh-Mu Double Triode
BaseNoval (B9A)
Filament12.6 V @ — mA

Construction

Primary TypeDual triode
EnvelopeTubular
Sections2

Filament / Heater

Heater NotesIndirectly heated

Absolute Maximum Ratings

Plate Voltage300 V
Plate Dissipation1 W
Cathode Current8 mA
H-C Voltage180 V

Audio Performance

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