Tube-number record
7802
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BrandTung-Sol
ClassMedium-Mu Twin Power Triode
BaseOctal
Filament6.3 V @ 2.5 mA
Construction
Primary TypeDual triode
EnvelopeT12
Base MaterialLarge wafer octal with metal sleeve
Sections2
Filament / Heater
Warm-up Time30s
Heater NotesHeater voltage tolerance +/- 10%
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation13 W
Cathode Current160 mA
H-C Voltage300 V
Audio Performance
Key Features
- High current
- High perveance
- Medium-mu
- Electronic regulated power supply service
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Per Section | 100 V | 20000 | — | 9 | 115 mA |
Application Notes
The high perveance of this tube permits large currents at low plate voltages. Use cathode resistors to equalize current division when sections are paralleled. A grid resistor of 1000 ohms is recommended for each section to prevent parasitic oscillation.
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