18045
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BrandPHILIPS
ClassOutput Pentode
BaseNoval
Filament18V @ 135mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect by A.C. or D.C.; Parallel or series 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 W
Key Features
- SQ (Special Quality)
- Long life > 10,000 hours
- Designed for telephone equipment
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 |
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