Tube-number record
7204/4CX250F
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BrandRCA
ClassBeam Power Tube
BaseSpecial / none
Filament26.5 V @ 580 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeCeramic-Metal
Sections1
Filament / Heater
Warm-up Time30s
Heater NotesUnipotential cathode. Heater voltage should be reduced at higher frequencies to compensate for back bombardment.
Absolute Maximum Ratings
Plate Voltage2000 V
Plate Dissipation250 W
Audio Performance
Power Output400 W
Key Features
- Forced-air cooled
- Ceramic-metal seals
- Coaxial-electrode structure
- Integral radiator
- Compact design
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Amplifier Note 3 | 1000 V | — | — | — | 150 mA |
| RF Amplifier Note 6 (475 Mc) | 2000 V | — | — | — | — |
Application Notes
For use at frequencies up to 500 Mc. Bilaterally interchangeable with the 4CX250F.
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