E 438
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BrandPhilips
ClassTriode
BaseO 35
Filament4V @ 1mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1.5 W
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage50 V
Audio Performance
Key Features
- Audion mit Widerstandskopplung
- Detector with resistance coupling
- L.F. amplifier with resistance coupling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| L.F. Amplifier (Resistance Coupling) | 200V | 1500 | 120000 | 38 | 0.3mA |
| L.F. Amplifier (High Resistance Coupling) | 200V | 1500 | 400000 | 38 | 0.1mA |
Application Notes
N.F.-Verstärker mit Widerstandskopplung. Max. overall length 91mm, max diameter 47mm.
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