4C25
0 Tubes in archive
BrandHeintz & Kaufman, Ltd.
ClassMulti-electrode high vacuum tube
BaseMedium 4-pin Ceramic
Construction
Primary TypeTriode
EnvelopeGlass
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation50 W
Grid 1 Voltage-750 V
Cathode Current150 mA
Audio Performance
Power Output260 W
Key Features
- Thoriated Tungsten Filament
- Medium Four Pin Ceramic Base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio-Frequency Power Amplifier (Two Tubes) | 2000V | - | 36000 | - | 180mA |
| Class C Radio-Frequency Power Amplifier (Plate Modulated) | 2000V | - | - | - | 110mA |
| Class C Radio-Frequency Power Amplifier (Unmodulated) | 3000V | 2800 | - | 28 | 100mA |
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