Tube-number record
W17
0 archive entries
W17 is a tube type in the TubeDatabase archive (class: Variable-Mu R.F. Pentode). Recorded specifications: brand Marconi, year 1951, construction Pentode, socket Miniature 7-pin (B7G), and maximum plate voltage 90 V. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassVariable-Mu R.F. Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeTubular
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Condition 1 | 45 V | — | — | — | 1.7 mA |
| Condition 2 | 67.5 V | — | — | — | 3.4 mA |
| Condition 3 | 90 V | — | — | — | 1.8 mA |
Application Notes
The screen grid may be supplied from a 90 volt source via a series resistor but the screen grid voltage must not exceed 67.5 at zero control grid voltage. Internal screen is connected to pins 1 and 5.
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