N78
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BrandGEC
ClassOutput Pentode
BaseB7G
Filament6.3V @ 640mA
Construction
Primary TypePentode
EnvelopeTubular
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation9 W
Grid 2 Voltage250 V
H-C Voltage150 V
Audio Performance
Typical THD9.2%
Power Output4 W
Key Features
- Miniature
- Low microphony
- Any mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Single Valve, Class A, Pentode Connection | 250V | 10500 | 40000 | - | 35mA |
| Single Valve, Class A, Triode Connection | 250V | 11400 | 2100 | 24 | - |
Application Notes
The maximum permissible D.C. resistance between control grid and cathode is limited to 0.27 MOhms with auto-bias and 0.1 MOhms with fixed bias. A retaining device should be used. Free air circulation is preferred.
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