DH63
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BrandMarconi
ClassDouble Diode Triode
BaseOctal
Filament6.3V @ 0.3mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsDouble Diode Triode
Filament / Heater
Heater NotesSeparate cathodes taken out to different pins.
Absolute Maximum Ratings
Plate Voltage340 V
Audio Performance
Key Features
- Detection
- A.V.C.
- Resistance coupled L.F. amplification
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Anode load 1.0 meg. | 340V | 1200 | - | - | 0.14mA |
| Anode load 0.25 meg. | 340V | 1200 | - | - | 0.7mA |
| Anode load 1.0 meg. | 275V | 1200 | - | - | 0.11mA |
| Anode load 0.25 meg. | 275V | 1200 | - | - | 0.6mA |
Application Notes
The total effective grid to cathode resistance of the DH63 should not exceed 4 megohms. When used as an amplifier, the grid leak of the subsequent valve should not be less than 0.5 megohm.
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