Tube-number record
PEN.25
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BrandMazda
ClassBattery Economy Output Pentode
BaseOctal
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) | 90 V | 4500 | — | — | 3.75 mA |
| Battery Operation (100V) | 100 V | 4500 | — | — | 4.2 mA |
| Battery Operation (120V) | 120 V | 4500 | — | — | 5 mA |
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.
Datasheets
Datasheet: PEN25.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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