Tube-number record
3B7/1291
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BrandTung-Sol
ClassDouble Triode
BaseLoctal
Construction
Primary TypeDual 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 | 90 V | 1850 | — | 20 | 10.4 mA |
| AF Power Amplifier - Class AB2 Push-Pull | 145 V | 1900 | — | 20 | 18.2 mA |
| RF Power Amplifier - Class C Push-Pull | 90 V | — | — | — | 15 mA |
| RF Power Amplifier - Class C Push-Pull | 145 V | — | — | — | 25 mA |
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