Tube-number record
7802
0 archive entries
7802 is a tube type in the TubeDatabase archive (class: Medium-Mu Twin Power Triode). Recorded specifications: brand Tung-Sol, year 1963, construction Dual triode, base Large wafer octal with metal sleeve, socket Octal, maximum plate voltage 250 V, and maximum plate dissipation 13 W. The archive does not yet hold a photographed example of this type.
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%
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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