14A7/12B7
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BrandTung-Sol
ClassPentode Voltage Amplifier
BaseLock-in
Filament12.6V @ 150mA
Construction
Primary TypePentode
EnvelopeGlass Bulb
Base MaterialLock-in
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation4 W
Grid 2 Voltage125 V
H-C Voltage90 V
Audio Performance
Key Features
- Coated Unipotential Cathode
- Lock-in Construction
- Any Mounting Position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100V | 2350 | 120000 | - | 13mA |
| Class A1 Amplifier | 250V | 2000 | 800000 | - | 9.2mA |
Application Notes
Designed for RF or IF service in AC/DC receivers.
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