25Y5
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BrandSylvania
ClassRectifier
Base6-pin Small
Filament25V @ 0.3mA
Construction
Primary TypeIndirectly Heated Diode
Rectifier TypeHalf-wave
EnvelopeST-12
Sections2
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage235 V
Cathode Current75 mA
H-C Voltage350 V
Audio Performance
Key Features
- Indirect heating
- Reinforced design for 220V operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Half-wave Rectifier | 150V | - | - | - | 75mA |
| Half-wave Rectifier | 235V | - | - | - | 75mA |
Application Notes
Specifically designed as a half-wave rectifier for 220V networks without the need for a series resistor. Both plates and cathodes are usually connected together for half-wave service.
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