Tube-number record
7905
0 archive entries
7905 is a tube type in the TubeDatabase archive (class: Beam Power Tube). Recorded specifications: brand RCA, year 1962, construction Beam tetrode / beam power, base Glass, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 10 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassBeam Power Tube
BaseNoval (B9A)
Construction
Primary TypeBeam 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
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 200 V | 6700 | — | 11.5 | 36 mA |
| As amplifier at 175 Mc | 300 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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