Tube-number record
7W7
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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
Plate Dissipation4 W
Grid 2 Voltage150 V
H-C Voltage90 V
Audio Performance
Key Features
- High Transconductance
- Low Grid-to-Plate Capacitance
- Sharp Cut-off
- Lock-in Construction
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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