Tube-number record
3CX3000A7/3CX3000F7
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BrandEIMAC
ClassPower Triode
BaseFlexible / flying leads
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
Base MaterialMetal/Ceramic
Sections1
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage5000 V
Plate Dissipation4000 W
Cathode Current2500 mA
Audio Performance
Power Output10500 W
Key Features
- High-mu
- Forced-air cooled
- Zero grid bias operation
- Low inductance cylindrical filament-stem
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class AB2 Cathode Driven | 4800 V | — | 1425 | 160 | 2000 mA |
| Class AB2 Grid Driven | 4000 V | — | 1750 | 160 | 740 mA |
| Class C Telegraphy Cathode Driven | 4800 V | — | — | 160 |
Application Notes
The tube provides relatively high power output as an amplifier, oscillator, or modulator at low plate voltages. Grounded-grid operation provides a power gain of over 20 times.
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