Tube-number record
7W7
0 archive entries
7W7 is a tube type in the TubeDatabase archive (class: Sharp Cut-off Pentode Voltage Amplifier). Recorded specifications: brand TUNG-SOL, year 1948, construction Pentode, socket Loctal, maximum plate voltage 300 V, and maximum plate dissipation 4 W. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassSharp Cut-off Pentode Voltage Amplifier
BaseLoctal
Filament6.3 V @ 450 mA
Construction
Primary TypePentode
EnvelopeGlass Bulb
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Fixed Screen Supply) | 300 V | 5800 | 300000 | — | 10 mA |
| Class A Amplifier (Series Screen Resistor) | 300 V | 5800 | 300000 | — | 10 mA |
Application Notes
Useful in high gain narrow band amplifier service.
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