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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

7905

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BrandRCA
ClassBeam Power Tube
BaseNoval (B9A)

Construction

Primary Type
Beam tetrode / beam power
EnvelopeT6-1/2
Base MaterialGlass
Sections1

Filament / Heater

MaterialCoated
Warm-up Time1s

Absolute Maximum Ratings

Plate Voltage300 V
Plate Dissipation10 W
Grid 2 Voltage250 V
Grid 1 Voltage-125 V
Cathode Current60 mA

Audio Performance

Power Output7 W
Key Features
  • Quick-Heating-Filament
  • Beam Power
  • Mobile-Communications Equipment

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier200 V6700—11.536 mA
As amplifier at 175 Mc300 V———60 mA

Application Notes

Designed for mobile-communications equipment where quick heating is required. Pins 4 and 5 (LC) should be grounded through a capacitor to minimize RF power absorption in the filament circuit.

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