Tube-number record
GM-3A
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ClassModulator Triode
Construction
Primary TypeTriode
Envelopeglass-to-metal
Filament / Heater
Materialcarbonized thoriated tungsten
Absolute Maximum Ratings
Plate Voltage6000 V
Plate Dissipation7500 W
Grid 1 Voltage600 V
Audio Performance
Key Features
- Forced water/air cooling
- Carbonized thoriated tungsten cathode
- Low-frequency no-distortion amplification
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Zero grid voltage condition | 1500 V | 22000 | — | 9 | 3000 mA |
Application Notes
The GM-3A triode is used in low-frequency no-distortion cathode-coupled amplifier circuits in electronic equipment.
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