7025
26 Tubes in archive
BrandSYLVANIA
ClassMiniature high-mu twin triode
BaseMiniature Button 9-Pin
Filament12.6V @ 150mA
Construction
Primary Typetwin triode
EnvelopeT-6 1/2
Sections2
Filament / Heater
Heater NotesCenter tapped heater permits operation on 12.6 or 6.3 volts.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 1 Voltage-50 V
H-C Voltage200 V
Audio Performance
Key Features
- Separate cathodes
- Improved noise and hum characteristics
- Center tapped heater
- Coated Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100V | 1250 | 80000 | 100 | 0.5mA |
| Class A1 Amplifier | 250V | 1600 | 62500 | 100 | 1.2mA |
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