3A/147J
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ClassGrounded Grid Oscillator Triode
BaseCoaxial Grid-Disc Mounting
Filament4V @ 700mA
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialDisc Seal
SectionsSingle
Filament / Heater
Heater NotesCathode is strapped inside the bulb to one heater lead
Absolute Maximum Ratings
Plate Voltage350 V
Plate Dissipation6 W
Cathode Current28 mA
Audio Performance
Power Output2 W
Key Features
- Disc seal construction
- Grounded grid design
- High frequency oscillator
- Oxide-coated cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Oscillator at 250V | 250V | 6000 | - | 35 | - |
Application Notes
The internal diameter of the outer conductor of any coaxial line system employed with this valve should not be less than 1.38 inches to avoid grid disc seal damage. Outputs between 1 and 2 watts are obtainable up to 750 Mc/s.
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