Tube-number record
4065
0 archive entries
4065 is a tube type in the TubeDatabase archive (class: Electrometer triode). Recorded specifications: year 1968, construction Triode, socket Subminiature, and maximum plate voltage 25 V. The archive does not yet hold a photographed example of this type.
ClassElectrometer triode
BaseSubminiature
Construction
Primary TypeTriode
EnvelopeSubminiature
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage25 V
Cathode Current0.25 mA
Audio Performance
Key Features
- Subminiature electrometer triode
- Low grid current
- Directly heated filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Electrometer Operation | 9 V | 80 | — | 2 | 0.1 mA |
Application Notes
In order to avoid excessive drift of the characteristics the filament voltage must be applied before the anode voltage. To avoid contamination of the glass, the tube should not be removed from its protective envelope until it is mounted into the equipment.
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