Tube-number record
PL3-500ZG
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BrandPenta Laboratories
ClassPower Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation500 W
Cathode Current400 mA
Audio Performance
Power Output1420 W
Key Features
- High-mu power triode
- Zero-bias Class AB2 operation
- Radiation and forced-air cooling
- Simplified circuitry design
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode Driven RF Linear Amplifier | 2500 V | — | — | 130 | 400 mA |
| Cathode Driven RF Linear Amplifier (High Voltage) | 3500 V | — | — | 130 | 400 mA |
| Grid Driven RF Power Amplifier | 3000 V | — | — | 130 |
Application Notes
Forced air cooling of the base, base seals, envelope, plate seal, and plate connector is required for all classes of operation when the PL3-500ZG is operated at or near the maximum plate dissipation rating. Zero-bias operation is not recommended at plate voltages exceeding 2500 volts.
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