X65
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BrandMarconi
ClassTriode Hexode
BaseOctal
Filament6.3V @ 0.3mA
Construction
Primary TypeTriode Hexode
Envelope114x40 mm
Filament / Heater
Heater NotesIn A.C. receivers one side of the heater should be taken to earth and the other side earthed through 0.001 uF.
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Audio Performance
Key Features
- All-wave receiver application
- High input impedance
- Negligible pulling at high frequencies
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Frequency Changer | 250V | - | 2500000 | - | - |
Application Notes
A tuned grid circuit is recommended but tuned anode can also be used. The heterodyne voltage is not critical, the change in gain between 5 and 20 volts being less than 3db.
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