Tube-number record
25CA5
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BrandTUNG-SOL
ClassPENTODE
BaseMiniature 7-pin (B7G)
Filament25 V @ 0.3 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeGlass Bulb
Sections1
Filament / Heater
Heater NotesAC OR DC
Absolute Maximum Ratings
Plate Voltage130 V
Plate Dissipation5 W
Grid 2 Voltage130 V
H-C Voltage200 V
Audio Performance
Typical THD6%
Power Output1.5 W
Key Features
- Miniature Construction
- Coated Unipotential Cathode
- High Power Sensitivity
- Low Plate and Screen Voltages
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 110 V | 8100 | 16000 | — | 42 mA |
| Class A1 Amplifier | 125 V | 9200 | 15000 | — | 37 mA |
Application Notes
Designed primarily for use in the audio frequency power output stage of television and radio receivers.
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