18040
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BrandPHILIPS
ClassPENTODE
BaseLoctal
Filament18V @ 200mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect heating, A.C. or D.C.; series or parallel supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation4.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current30 mA
H-C Voltage50 V
Audio Performance
Typical THD5%
Power Output1 W
Key Features
- SQ (Special Quality)
- Telephone equipment use
- Long life
- Indirectly heated
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Output valve | 210V | 11000 | 300000 | 37 | 20mA |
| Pre-amplifier | 210V | 10000 | 400000 | - | 15mA |
Application Notes
The end point of life is determined by: Ia min. 13 mA, Ig2 min. 3 mA, S min. 7.5 mA/V. Grid bias can be automatic or fixed.
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