Tube-number record
12F8
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BrandSYLVANIA
ClassDouble detector diode and remote cutoff pentode
BaseNoval (B9A)
Filament12.6 V @ 150 mA
Construction
Primary TypePentode
EnvelopeT6 1/2
SectionsTriple (Pentode + 2 Diodes)
Filament / Heater
Heater NotesDesigned to operate over 10.0 to 15.9 volt range for automotive service.
Absolute Maximum Ratings
Plate Voltage30 V
Grid 2 Voltage30 V
H-C Voltage30 V
Audio Performance
Key Features
- Remote cutoff pentode
- Common cathode
- Automotive 12 volt storage battery operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Voltage Amplifier | 12.6 V | 1000 | 330000 | — | 1 mA |
Application Notes
The Sylvania Type 12F8 is a double detector diode and remote cutoff pentode with a common cathode. The pentode was designed for service as an AF voltage amplifier where the potentials are obtained from a 12 volt automobile storage battery.
Datasheets
Datasheet: 12F8.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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