203-H
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BrandAMPEREX
ClassTransmitting Tube
BaseStandard Jumbo 4 Large Pin Bayonet
Construction
Primary TypeRadiation Cooled Triode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage1500 V
Plate Dissipation100 W
Grid 1 Voltage-400 V
Audio Performance
Power Output267 W
Key Features
- Radiation Cooled
- Thoriated Tungsten Filament
- Vertical or Horizontal Mounting
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier or Modulator Class B | 1250V | 4500 | - | 25 | 320mA |
| RF Power Amplifier Class B Telephony | 1250V | - | - | - | 106mA |
| Plate-Modulated RF Power Amplifier Class C Telephony | 1000V | - | - | - | 150mA |
| RF Power Amplifier or Oscillator Class C Telegraphy | 1250V | - | - | - | 150mA |
Application Notes
Grid voltages are given with respect to the mid-point of the filament operated on A.C. If D.C. is used, each stated value of grid voltage should be decreased by 5 volts and the circuit returns made to the negative end of the filament.
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