Tube-number record
ZD17
0 archive entries
ZD17 is a tube type in the TubeDatabase archive (class: Miniature Diode-Pentode). Recorded specifications: brand Marconi, year 1953, construction Multi-section, socket Miniature 7-pin (B7G), and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassMiniature Diode-Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypeMulti-section
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 | 67.5 V | 800 | 17500 | 14 | — |
| Pentode connection | 45 V | — | — | — | — |
| Pentode connection | 67.5 V | — | — | — | — |
| Pentode connection | 90 V | — | — | — | — |
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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