AF3
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BrandPhilips Miniwatt
ClassHF Pentode Selectode
BaseSide-contact (P-socket)
Filament4V @ 650mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Grid 1 Voltage-55 V
H-C Voltage80 V
Audio Performance
Key Features
- Variable-mu (Selektode)
- Low cross-modulation
- Short-wave capability (down to 12m)
- High internal resistance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard (Operating Data) | 250V | 1800 | 1200000 | - | 8mA |
| Screen Grid 85V | 250V | 2100 | - | - | 7.5mA |
| Screen Grid 60V | 250V | 1500 | - | - | 4mA |
| Max transconductance point | 250V | 2800 | - | - | - |
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