Tube-number record
14F7
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BrandTUNG-SOL
ClassDouble Triode
BaseLoctal
Filament12.6 V @ 150 mA
Construction
Primary TypeDual triode
EnvelopeT-9 Glass
Base MaterialLock-in
Sections2
Filament / Heater
Heater NotesAC OR DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
H-C Voltage90 V
Audio Performance
Key Features
- Lock-in construction
- Coated unipotential cathode
- T-9 glass bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier (Unit 1 or 2) | 100 V | 1125 | 62000 | 70 | 0.65 mA |
| Class A1 Amplifier (Unit 1 or 2) | 250 V | 1600 | 44000 | 70 | 2.3 mA |
Application Notes
Designed for use as a voltage amplifier in resistance coupled cascade or phase inverter service.
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