P.T. 41
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BrandCossor
ClassDirectly Heated Pentode
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage200 V
Grid 1 Voltage-12.5 V
Audio Performance
Key Features
- Directly heated
- High sensitivity
- Sufficient volume for domestic purposes
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Output Pentode | 250V | 3000 | - | - | 30mA |
Application Notes
Automatic bias is obtained for directly heated valves by the use of a small centre tapped resistance across the filament terminals. Correct anode load should be used for full undistorted output.
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