2C39A
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BrandEimac
ClassHigh-Mu UHF Triode
BaseConcentric Collets
Filament6.3V @ 0.95mA
Construction
Primary TypeTriode
EnvelopeCeramic-Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesHeater voltage should be reduced at frequencies above 400 MHz to compensate for back-heating.
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation100 W
Grid 1 Voltage-150 V
Cathode Current125 mA
Audio Performance
Key Features
- Ceramic-metal construction
- Planar design
- Ruggedized
- Grounded grid operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| CW Power Amplifier 500 Mc | 800V | 25000 | - | 100 | 80mA |
| RF Oscillator 2500 Mc | 900V | - | - | 100 | 90mA |
| Plate-Modulated 500 Mc | 600V | - | - | 100 | 65mA |
Application Notes
Recommended heater voltage reduction: 6.0V (400-1000MHz), 5.5V (1000-1500MHz), 5.0V (1500-2000MHz), 4.5V (Above 2000MHz). Pre-heat time of 30-60 seconds required.
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