E 499
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BrandPhilips Miniwatt
ClassHigh-mu Triode
BaseO 35
Filament4V @ 1000mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation1.5 W
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage50 V
Audio Performance
Key Features
- High amplification factor
- Anode bend detector capability
- Resistance-capacitance coupling optimized
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| L.F. amplifier with resistance coupling (0.3 M.Ohm external) | 200V | 4000 | 100000 | 99 | 0.2mA |
| L.F. amplifier with resistance coupling (1.0 M.Ohm external) | 200V | - | 330000 | - | 0.08mA |
Application Notes
Commonly used as an anode bend detector or L.F. amplifier with resistance coupling.
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