4D.1
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BrandBrimar
ClassTriode
Base7-pin
Filament13V @ 200mA
Construction
Primary TypeIndirectly Heated Triode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesSuitable for A.C., universal, or automobile receivers
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Indirectly heated
- Suitable for detector use (grid leak or anode bend)
- Suitable as separate oscillator in superheterodyne receivers
- Automatic bias recommended for L.F. Amplifier use
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Amplifier Characteristics | 100V | 4000 | 10000 | 40 | 2.5mA |
| Amplifier | 200V | - | - | - | 5mA |
| Amplifier | 150V | - | - | - | 3mA |
| Grid Leak Detector | 250V | - | 25000 | - | - |
Application Notes
Eminently suitable for use as a detector of the grid leak and condenser or anode bend (grid biassed) type.
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