Tube-number record
HF PENTODE
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BrandTESLA
ClassVariable-mu Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide-coated
Absolute Maximum Ratings
Plate Voltage90 V
Plate Dissipation0.35 W
Grid 2 Voltage67.5 V
Cathode Current5.5 mA
Audio Performance
Key Features
- Directly heated filament
- Low power consumption
- Variable strmost (remote cutoff)
- HF/MF Amplification
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF/MF Amplifier (Standard) | 90 V | 750 | 500000 | 400 | 3.5 mA |
| Operation Point 1 | 45 V | 650 | 350000 | — | 1.7 mA |
| Operation Point 2 | 67.5 V | 750 | 250000 | — | 3.4 mA |
Application Notes
Suppressor grid is internally connected to the negative end of the filament.
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