SS8
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BrandVEB Funkwerk Erfurt
ClassElectrometer Tube
Base10-poliger Stahlröhrensockel
Filament20V @ 100mA
Construction
Primary TypeDouble-system bridge electrometer
EnvelopeGlass
Sections2
Filament / Heater
Absolute Maximum Ratings
Plate Voltage15 V
Plate Dissipation0.04 W
Grid 2 Voltage8 V
Cathode Current1.5 mA
Audio Performance
Key Features
- Bridge circuit for measurement stability
- Very high input resistance
- Low grid leakage current
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation Point A | 8V | 100 | - | - | 0.4mA |
| Operation Point B | 12V | 75 | - | - | 0.6mA |
Application Notes
Specifically designed for vacuum tube voltmeters, teraohmmeters, and measurement of extremely small currents and voltages. System I is used as the measuring system with a highly insulated control grid, while System II is used as a bridge system to compensate for power supply fluctuations.
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