HY25
0 Tubes in archive
BrandHytron
ClassTriode Transmitting Tube
Base4 Pin UX Ceramic
Construction
Primary TypeTriode
EnvelopeST-16
Base MaterialCeramic
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage800 V
Plate Dissipation25 W
Grid 1 Voltage-200 V
Cathode Current75 mA
Audio Performance
Typical THD2%
Power Output75 W
Key Features
- High transconductance
- Zero bias operation at 500V plate
- High amplification factor
- Thoriated tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 800V | 3000 | - | 55 | - |
| A.F. Power Amplifier Class B (2 tubes) | 800V | - | 9000 | - | 140mA |
| R.F. Power Amplifier Class C Telegraphy | 750V | - | - | - | 70mA |
| Power Doubler | 750V | - | - | - | 75mA |
Application Notes
The HY25 is a high-mu triode designed for RF power amplification and Class B modulation. It operates at maximum ratings up to 60 megacycles.
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