5D/100-A
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BrandStandard
ClassRF Power Pentode
Construction
Primary TypePentode
EnvelopeBulb
Sections1
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation1000 W
Grid 2 Voltage850 V
Audio Performance
Key Features
- Thoriated tungsten filament
- Constant voltage filament
- Suppressor grid modulation capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Amplifier Unmodulated (1) | 2500V | 4500 | - | - | 540mA |
| Class C Amplifier Unmodulated (2) | 3000V | 4500 | - | - | 650mA |
| Class C Amplifier Suppressor Modulated | 3000V | 4500 | - | - | 450mA |
Application Notes
For higher frequencies than 10 MHz, the anode voltage should be reduced proportionately; at 20 MHz max anode voltage is 2,500V. Suppressor modulation provides distortion less than 5% at 80% modulation.
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