Tube-number record
DUPLEX-DIODE TETRODE
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BrandGeneral Electric
ClassCombined detector, AVC rectifier, and transistor driver
BaseNoval (B9A)
Filament12.6 V @ 375 mA
Construction
Primary TypeTetrode
EnvelopeT-6.5
Base MaterialGlass
SectionsDuplex-Diode Tetrode
Filament / Heater
Heater NotesIntended for use in automobile receivers where supply is a 12-volt battery.
Absolute Maximum Ratings
Plate Voltage16 V
Grid 2 Voltage16 V
Grid 1 Voltage16 V
Cathode Current5 mA
H-C Voltage16 V
Audio Performance
Typical THD3%
Power Output0.005 W
Key Features
- Miniature duplex-diode
- Space-charge-grid tetrode
- Operation directly from 12-volt storage battery
- Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 12.6 V | 8500 | 900 | 7.4 | 9 mA |
| Class A Amplifier | 12.6 V | — | — | — | 6.8 mA |
Application Notes
Specifically designed for automobile receivers as a combined detector, AVC rectifier, and transistor driver.
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