6AJ8
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BrandPhilips
ClassTriode-Heptode
BaseSmall button noval 9-pin
Filament6.3V @ 300mA
Construction
Primary TypeTriode-Heptode
EnvelopeGlass
SectionsTriode, Heptode
Filament / Heater
MaterialCoated unipotential
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.7 W
Grid 2 Voltage125 V
Grid 1 Voltage-1.3 V
Cathode Current12.5 mA
H-C Voltage100 V
Audio Performance
Key Features
- Triode-Heptode for FM and TV receivers
- Internal shield on pin 3
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode section as mixer | 250V | 175 | 1000000 | - | 3.25mA |
| Heptode section as HF/IF amplifier | 250V | 2400 | 700000 | 20 | 6.5mA |
| Triode section typical | 100V | 3700 | - | 22 | 13.5mA |
| Triode section as oscillator | 250V | 550 | - | - | 4.5mA |
Application Notes
The 6AJ8 as frequency changer can be used in combination with 6BY7 or 6N8 as I.F. amplifier.
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