4069
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BrandPhilips
ClassElectrometer Triode
BaseSubminiature Leads
Construction
Primary TypeTriode
EnvelopeSubminiature
SectionsSingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage25 V
Cathode Current0.25 mA
Audio Performance
Key Features
- Low grid current 2x10^-13 A
- Linear and logarithmic use
- Controlled logarithmic relationship between grid current and anode current
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Linear | 9V | 80 | - | 2 | 0.1mA |
Application Notes
To prevent photo emission from the grid, the tube should be operated in darkness or at a low ambient light level. To avoid excessive drift, the filament voltage must be applied before the anode voltage. Soldered connections must be at least 13 mm from the seal.
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