E81L
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BrandPhilips
ClassOutput Pentode
BaseNoval
Filament6.3V @ 375mA
Construction
Primary Typepentode
Envelopeglass
Base Materialglass
Sectionssingle
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; series or parallel supply
Absolute Maximum Ratings
Plate Voltage210 V
Plate Dissipation4.5 W
Grid 2 Voltage210 V
Grid 1 Voltage-1.1 V
Cathode Current30 mA
H-C Voltage120 V
Audio Performance
Typical THD5%
Power Output1.4 W
Key Features
- Special Quality (SQ)
- Long life
- Shock and vibration resistant
- Telephone equipment quality
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Output Pentode | 210V | 11000 | 300000 | 36 | 20mA |
| Pre-amplifier | 210V | 10000 | 400000 | - | 15mA |
Application Notes
Specifically designed for use in telephone equipment with a life expectancy exceeding 10,000 hours.
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