Tube-number record
DH77
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BrandMarconi
ClassDouble-Diode-Triode
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 0.3 mA
Construction
Primary TypeMulti-section
EnvelopeTubular
Sections3
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Miniature construction
- Low microphony
- No internal or external screening
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 250 V | 1200 | 58000 | 70 | 1 mA |
Application Notes
Equipment should be designed to minimise microphony although inherent order is low.
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