EY 91
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BrandPhilips
ClassHigh-vacuum HALF-WAVE RECTIFIER
BaseMiniature
Filament6.3V @ 0.42mA
Construction
Primary TypeDiode
Rectifier TypeHalf-wave
EnvelopeMiniature Glass
SectionsSingle
Filament / Heater
Heater NotesIndirect by A.C. parallel supply
Absolute Maximum Ratings
Plate Voltage250 V
Cathode Current75 mA
H-C Voltage300 V
Audio Performance
Key Features
- High-vacuum
- Indirectly heated
- Half-wave rectification
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier (Vtr=250V, C=32uF) | 250V | - | 100 | - | 75mA |
| Rectifier (Vtr=250V, C=16uF) | 250V | - | 50 | - | 75mA |
| Rectifier (Vtr=200V, C=32uF) | 200V | - | 70 | - | 75mA |
| Rectifier (Vtr=200V, C=16uF) | 200V | - | 30 | - | 75mA |
Application Notes
Designed for A.C. parallel supply heating.
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