EF86
9 Tubes in archive
BrandPhilips
ClassA.F. Amplifier Pentode
BaseNoval
Filament6.3V @ 200mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect by A.C. or D.C.; series or parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 2 Voltage200 V
Cathode Current6 mA
H-C Voltage100 V
Audio Performance
Typical THD5%
Key Features
- Low microphony
- Low hum
- Low noise
- Internal shielding
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 250V | 2000 | 2500000 | 38 | 3mA |
| Triode connected (g2 to a, g3 to k) | 250V | - | - | 23.5 | 2.53mA |
Application Notes
Specifically designed for high-gain audio pre-amplifier stages. When used as a phase inverter immediately preceding the output stage, Rkf max may be 120 kOhms.
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