Tube-number record
70L7-GT
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BrandGeneral Electric
ClassRectifier-Beam Power Amplifier
BaseOctal
Filament70 V @ 0.15 mA
Construction
Primary TypeDisplay / CRT
EnvelopeT-9
Base MaterialPhenolic
SectionsDouble (Rectifier + Beam Power Amplifier)
Filament / Heater
Heater NotesA-C or D-C operation
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation5.6 W
Grid 2 Voltage150 V
H-C Voltage175 V
Audio Performance
Typical THD10%
Power Output1.8 W
Key Features
- Half-wave rectifier
- Beam power amplifier
- Series heater operation
- Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 110 V | 7500 | 15000 | — | 40 mA |
Application Notes
The 70L7-GT is intended for use as the power rectifier and power amplifier tube in circuits requiring series heater operation.
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