Tube-number record
WT77
0 archive entries
WT77 is a tube type in the TubeDatabase archive (class: Variable-Mu R.F. Pentode). Recorded specifications: brand Marconi, year 1952, construction Pentode, socket Miniature 7-pin (B7G), maximum plate voltage 250 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassVariable-Mu R.F. Pentode
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 0.2 mA
Construction
Primary TypePentode
EnvelopeTubular
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard | 200 V | 2500 | 500000 | — | 8 mA |
Application Notes
The maximum D.C. resistance between control grid and cathode must not exceed 4M Ohms.
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