307A
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BrandWestern Electric
ClassPentode
BaseMedium 5-pin with bayonet pin
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation15 W
Grid 2 Voltage300 V
Grid 1 Voltage7 V
Cathode Current60 mA
Audio Performance
Power Output9.1 W
Key Features
- Filamentary suppressor-grid pentode
- Moderate-power
- Radio-frequency power amplifier
- Suppressor-grid modulated amplifier
- Frequency multiplier
- Oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio | 200V | - | - | - | 36.5mA |
| Class A Audio | 250V | - | - | - | 50mA |
| Class A Audio (Maximum) | 300V | - | - | - | 43mA |
| Suppressor-Modulated Class C | 500V | - | - | - | 40mA |
| Unmodulated Class C | 500V | - | - |
Application Notes
The 306A tube gives better performance in audio-frequency applications and is preferable except where filament characteristics preclude its use. Suppressor grid should not be driven more than 20V positive.
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