Tube-number record
7057
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BrandRCA
ClassMedium-Mu Twin Triode
BaseNoval (B9A)
Filament13.5 V @ 0.18 mA
Construction
Primary TypeTriode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesVoltage range: 12 to 15 volts
Absolute Maximum Ratings
Plate Voltage275 V
Plate Dissipation2.2 W
H-C Voltage150 V
Audio Performance
Key Features
- 9-Pin Miniature Type
- Mobile communications equipment
- Useful as RF amplifier in direct-coupled cathode-drive circuits up to 200 Mc
- Internal shield
- Heater-cycling life test
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 150 V | 6800 | 5300 | 36 | 10 mA |
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