1F1
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BrandNational Union
ClassCurrent-Regulating Ballast Tube
BaseSmall 4-prong
Construction
Primary TypeBallast
EnvelopeST-12
Filament / Heater
Absolute Maximum Ratings
Plate Voltage3.2 V
Audio Performance
Key Features
- Current-regulating device
- Designed for battery-operated radio receivers
- Maintains constant current over dry-cell voltage discharge
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Current Regulation | 0.7V | - | - | - | 720mA |
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