Tube-number record
4308-B
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BrandStandard
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage2250 V
Plate Dissipation250 W
Cathode Current325 mA
Audio Performance
Power Output575 W
Key Features
- Thoriated tungsten filament
- Constant voltage type
- High power output
- Extra large bayonet base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A AF Amp or Modulator (1) | 1500 V | 7500 | 1070 | 8 | 135 mA |
| Class A AF Amp or Modulator (2) | 1000 V | 7500 | 1070 | 8 | 210 mA |
| Class B AF Amp (Balanced 2-valve, Max Signal) | 1750 V | — | — | — | 300 mA |
| Radio Frequency Class B Telephony | 1750 V | — | — | — | 215 mA |
| Radio Frequency Class C Telegraphy | 1750 V | — | — | — | 300 mA |
Application Notes
Maximum frequency for standard ratings is 1.5 Mc. Above this, the anode voltage must be reduced (e.g., 750V at 4.5 Mc).
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