Tube-number record
70A7GT
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BrandTUNG-SOL
ClassBeam Power Amplifier / Half-Wave Rectifier
BaseOctal
Filament70 V @ 150 mA
Construction
Primary TypeRectifier
EnvelopeT-9
Base MaterialIntermediate 8 Pin Octal
Sections2
Filament / Heater
Heater NotesTapped heater for pilot lamp connection between pins 6 and 7.
Absolute Maximum Ratings
Plate Voltage110 V
Grid 2 Voltage110 V
Audio Performance
Typical THD6.5%
Power Output1.5 W
Key Features
- Combined Beam Power Amplifier and Half-Wave Rectifier
- Tapped Heater for Pilot Lamp
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 110 V | 5800 | — | 80 | 40 mA |
Application Notes
Used with a 0.15 ampere pilot lamp connected between pins 6 and 7. Rectifier DC output flows through the pilot lamp section; the tube should not be used without a pilot lamp.
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