PEN.25
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BrandMazda
ClassBattery Economy Output Pentode
BaseBritish Octal
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Grid 2 Voltage150 V
Audio Performance
Typical THD11%
Power Output0.4 W
Key Features
- High sensitivity
- Battery economy
- Low filament consumption
- Small dimensions
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Battery Operation (90V) | 90V | 4500 | - | - | 3.75mA |
| Battery Operation (100V) | 100V | 4500 | - | - | 4.2mA |
| Battery Operation (120V) | 120V | 4500 | - | - | 5mA |
Application Notes
The Pen.25 is a high sensitivity output pentode designed for battery economy, particularly recommended for battery portable receivers. It should be biased by means of a resistance in the common negative H.T. lead. An anode load of 14,000 ohms is suitable.
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