304B
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BrandWestern Electric
ClassTriode
BaseMedium four-pin thrust
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation50 W
Grid 1 Voltage-225 V
Cathode Current100 mA
Audio Performance
Power Output140 W
Key Features
- Air-cooled
- Ultra high frequency operation
- Interchangeable with 304A
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 1250V | 2000 | 5500 | 11 | 40mA |
| Class B Audio Amplifier (per pair) | 1250V | - | - | - | 100mA |
| Class C RF Oscillator | 1250V | - | - | - | 100mA |
Application Notes
Designed for ultra high frequencies. Grid and plate terminals at top of bulb require cooling lugs for operation above 30 megacycles. Free circulation of air must be provided.
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