3-500ZG
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BrandRF Parts
ClassPower Triode
Base5 Pin Special
Construction
Primary TypeTriode
EnvelopeGlass
Sections1
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation500 W
Grid 1 Voltage-200 V
Cathode Current400 mA
Audio Performance
Key Features
- Zero-bias operation
- High-mu triode
- Forced-air cooling required
- Thoriated-tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class AB2 Cathode Driven (CW) | 3000V | - | 4200 | - | 400mA |
| Class AB2 Cathode Driven (CW) | 3500V | - | 5000 | - | 400mA |
| Class C Telegraphy Grid Driven | 3500V | - | 5700 | - | 300mA |
| Switching Modulator | 9000V | - | - | - | 180mA |
Application Notes
The filament voltage, as measured at the socket, should be maintained within the range of 4.75 to 5.25 volts. Inrush current should be limited to two times normal current during turn-on. Forced-air cooling is required to maintain the base seals below 200°C.
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