9D.2
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BrandBrimar
ClassPentode
Base7-pin
Filament13V @ 0.2mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage125 V
Audio Performance
Key Features
- Variable mu
- Indirectly heated
- R.F. or I.F. amplifier
- Low anode-grid leakage capacity
- Control grid on top cap to reduce mains hum
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Characteristics | 250V | 1650 | 600000 | 1000 | 10mA |
| Variable Mu Cutoff Point | 250V | 10 | - | - | - |
| Operating Point 2 | 200V | - | - | - | 7mA |
| Operating Point 3 | 140V | - | - | - | 6.5mA |
| Operating Point 4 | 95V | - | - | - |
Application Notes
Suitable for use in A.C., universal or automobile receivers. The variable mu characteristic eliminates cross modulation or modulation distortion.
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