Tube-number record
TP.25
0 archive entries
TP.25 is a tube type in the TubeDatabase archive (class: Battery Economy Triode Pentode). Recorded specifications: brand Mazda, construction Multi-section, socket Octal, and maximum plate voltage 150 V. The archive does not yet hold a photographed example of this type.
BrandMazda
ClassBattery Economy Triode Pentode
BaseOctal
Construction
Primary TypeMulti-section
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 | 120 V | 225 | — | — | 0.5 mA |
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.
Datasheets
Datasheet: TP25.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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