306A
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BrandWestern Electric
ClassModerate-power, filamentary, suppressor-grid pentode
BaseWestern Electric 141A
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMedium, five-pin thrust type with bayonet pin
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation15 W
Grid 2 Voltage300 V
Grid 1 Voltage30 V
Cathode Current60 mA
Audio Performance
Power Output8.8 W
Key Features
- Filamentary
- Suppressor-grid pentode
- Moderate power
- Internal connection between suppressor and filament center
- Top cap control grid
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio-Frequency Amplifier | 200V | 3700 | 70000 | 260 | 32mA |
| Class A Audio-Frequency Amplifier | 250V | 4050 | 62000 | 250 | 43mA |
| Class A Audio-Frequency Amplifier (Maximum) | 300V | 4150 | 70000 | 290 | 48mA |
Application Notes
Used as an audio-frequency amplifier for power outputs up to 8 watts, radio-frequency amplifier, oscillator, modulator, and frequency multiplier. Suitable for high-frequency circuits up to 70 megacycles.
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