ZD17
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BrandMarconi
ClassMiniature Diode-Pentode
BaseB7G
Construction
Primary TypeDiode-Pentode
EnvelopeTubular
Sections2
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage90 V
Cathode Current3 mA
Audio Performance
Key Features
- Miniature
- Directly Heated Filament
- Low microphony
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode connection | 67.5V | 800 | 17500 | 14 | - |
| Pentode connection | 45V | - | - | - | - |
| Pentode connection | 67.5V | - | - | - | - |
| Pentode connection | 90V | - | - | - | - |
Application Notes
When operating the filament from a mains supply, the voltage should be adjusted to 1.3 or the current to 47.5 mA mean. No internal or external screening is fitted.
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