Tube-number record
DH77
0 archive entries
DH77 is a tube type in the TubeDatabase archive (class: Double-Diode-Triode). Recorded specifications: brand Marconi, year 1951, construction Multi-section, socket Miniature 7-pin (B7G), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
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
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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