7258
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BrandSylvania
ClassReceiving Tube
BaseMiniature Button 9-Pin
Filament12V @ 210mA
Construction
Primary TypeSharp cutoff pentode and medium mu triode
Envelope6-2
Base MaterialMiniature Button 9-Pin
SectionsDouble
Filament / Heater
Heater NotesHeater current at 13.5 Volts
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation2.8 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- Sharp cutoff pentode
- Medium mu triode
- Mobile applications
- Coated Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 150V | 4500 | 4700 | 21 | 15mA |
| Pentode Section | 125V | 7800 | 170000 | - | 12mA |
Application Notes
The pentode section may be used as an RF, IF or reactance tube. The triode section may be used as a low frequency oscillator or general purpose amplifier.
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