Tube-number record
117L7/M7GT
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BrandTung-Sol
ClassDiode-Beam Pentode
BaseOctal
Filament117 V @ 90 mA
Construction
Primary TypeMulti-section
EnvelopeGlass Bulb
Base MaterialIntermediate Shell
Sections2
Filament / Heater
Heater NotesCoated Unipotential Cathodes
Absolute Maximum Ratings
Plate Voltage117 V
Plate Dissipation6 W
Grid 2 Voltage117 V
H-C Voltage175 V
Audio Performance
Typical THD5%
Power Output0.85 W
Key Features
- Any Mounting Position
- Combined Half-Wave Rectifier and Beam Power Amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Audio Power Amplifier (Pentode) | 105 V | 5300 | 17000 | — | 43 mA |
| Half-Wave Power Rectifier (Diode) | 117 V | — | 15 | — | 75 mA |
Application Notes
Designed for AC/DC service from a 117 volt line in three-way portable receivers.
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