7DJ8
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BrandRogers
ClassDouble Triode
BaseE 9-1
Filament7V @ 300mA
Construction
Primary TypeDouble Triode
EnvelopeT 6-1/2
Sections2
Filament / Heater
Absolute Maximum Ratings
Plate Voltage130 V
Plate Dissipation1.8 W
Grid 1 Voltage-50 V
Cathode Current25 mA
H-C Voltage80 V
Audio Performance
Key Features
- High transconductance
- Low noise
- Unipotential cathode
- Internal shield
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Each section | 90V | 12500 | - | 33 | 15mA |
Application Notes
Designed for use as cascode amplifier in television receiver tuners. A voltage divider should be used for the grid of the grounded-grid section to avoid exceeding maximum plate voltage.
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