3B7/1291
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BrandTung-Sol
ClassDouble Triode
BaseLock-In
Construction
Primary TypeDouble Triode
EnvelopeT-9
Sections2
Filament / Heater
MaterialCoated
Absolute Maximum Ratings
Plate Voltage180 V
Plate Dissipation2.7 W
Cathode Current15 mA
Audio Performance
Typical THD8%
Power Output1.5 W
Key Features
- Lock-in construction
- Directly heated cathode
- UHF capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier - Class AB2 Push-Pull | 90V | 1850 | - | 20 | 10.4mA |
| AF Power Amplifier - Class AB2 Push-Pull | 145V | 1900 | - | 20 | 18.2mA |
| RF Power Amplifier - Class C Push-Pull | 90V | - | - | - | 15mA |
| RF Power Amplifier - Class C Push-Pull | 145V | - | - | - | 25mA |
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