Tube-number record
X109
0 archive entries
X109 is a tube type in the TubeDatabase archive (class: Triode-Hexode Frequency Changer). Recorded specifications: brand Marconi, year 1952, construction Multi-section, socket Noval (B9A), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassTriode-Hexode Frequency Changer
BaseNoval (B9A)
Filament19 V @ 0.1 mA
Construction
Primary TypeMulti-section
EnvelopeTubular
SectionsTwo
Filament / Heater
Heater NotesIndirectly Heated
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Cathode Current20 mA
Audio Performance
Key Features
- Miniature
- Indirectly Heated
- Frequency Changer
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 100 V | 2800 | — | 22 | 10 mA |
| Mixer Operation (Hexode) | 175 V | 710 | 250000 | — | 4.3 mA |
Application Notes
Frequency changer for operation up to 100 Mc/s. Equipment should be designed to minimize microphony. A separate screening can should be used.
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