Tube-number record
3CX2500A3
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BrandEIMAC
ClassMedium-Mu Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeCeramic and Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage6000 V
Plate Dissipation2500 W
Cathode Current2500 mA
Audio Performance
Power Output13000 W
Key Features
- Forced-air cooled
- External anode
- Low-inductance cylindrical filament-stem structure
- All ceramic and metal construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier or Oscillator | 4000 V | 20000 | — | 22.5 | 2500 mA |
| RF Power Amplifier or Oscillator | 6000 V | 20000 | — | 22.5 | 2080 mA |
| AF Power Amplifier or Modulator | 6000 V | — | — | 22.5 | 1500 mA |
Application Notes
Forced-air cooling must be provided to hold the ceramic-to-metal seals and anode core temperature below 250°C. Filament voltage should be 7.5V with max allowable variations of 7.12 to 7.87V.
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