Tube-number record
GENERAL PURPOSE TRIODE
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BrandCunningham
ClassVacuum Tube
Base4-pin
Construction
Primary TypeTriode
EnvelopeT-8
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage90 V
Audio Performance
Key Features
- Dry-cell operation
- Low power consumption
- Portable receivers
- Thoriated-tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Amplifier | 90 V | 425 | 15500 | 6.6 | 2.5 mA |
| Grid Bias Detector | 90 V | — | — | — | 0.2 mA |
| Grid Leak Detector | 45 V | — | — | — | — |
Application Notes
The filaments are designed for operation with three No. 6 dry-cells connected in series. In multi-tube receivers, use six or nine No. 6 dry-cells in series-parallel for a 4.5V source to decrease current drain per cell. A filament rheostat should be used to adjust filament voltage to the recommended value.
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