Tube-number record
B 4438
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BrandPhilips
ClassPower Pentode
BaseSpecial / none
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation3 W
Grid 2 Voltage400 V
Grid 1 Voltage-0.4 V
Cathode Current15 mA
Audio Performance
Power Output1.12 W
Key Features
- Miniwatt series
- Power valve
- Endstufe
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Operation 1 | 250 V | 1400 | 50000 | 70 | 10 mA |
| Standard Operation 2 | 250 V | 1600 | 60000 | 100 | 12 mA |
Application Notes
High sensitivity power output stage valve.
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