Tube-number record
1F1
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BrandNational Union
ClassCurrent-Regulating Ballast Tube
Base4-pin
Construction
Primary TypeOther / special
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 | 0.7 V | — | — | — | 720 mA |
Datasheets
Datasheet: 1F1.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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