TP.25
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BrandMazda
ClassBattery Economy Triode Pentode
BaseMazda Octal
Construction
Primary TypeTriode-Pentode
EnvelopeSmall, metallised
Sections2
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage150 V
Grid 2 Voltage150 V
Audio Performance
Key Features
- Battery economy
- Low filament consumption
- Variable-mu characteristics
- Metallised bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Self-oscillating frequency changer | 120V | 225 | - | - | 0.5mA |
Application Notes
The TP.25 is a triode pentode for use as a self-oscillating frequency changer in battery operated all-wave receivers. The oscillator grid and the suppressor grid of the pentode are joined internally.
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