Tube-number record
4068
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BrandPhilips
ClassElectrometer Pentode
BaseSubminiature
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
SectionsSingle
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage45 V
Grid 2 Voltage45 V
Cathode Current0.18 mA
Audio Performance
Key Features
- Subminiature construction
- Very low grid current
- High input impedance
- Directly heated filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 10 V | 10.5 | 10500000 | 110 | 0.005 mA |
Application Notes
Filament voltage must be applied before anode and screen-grid voltages. To avoid contamination, the tube should not be removed from its protective envelope until fitted.
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