PT 15
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BrandMarconi
ClassRF Transmitting Pentode
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Materialoxide-coated dull emitter
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation30 W
Grid 2 Voltage300 V
Grid 1 Voltage-200 V
Cathode Current100 mA
Audio Performance
Key Features
- Radio-frequency transmitting pentode
- Oxide-coated dull emitter filament
- Suitable as oscillator, RF amplifier, or frequency multiplier
- Supports modulation on control grid, suppressor grid, anode, or screen grids
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy (Vg3 +40 V) | 1250V | 2800 | 12500 | - | 90mA |
| Class C Anode Modulated | 1000V | - | 30000 | - | 80mA |
Application Notes
The figures quoted for maximum permissible ratings apply only to operation at wavelengths down to 20 m (15 Mc/s). At shorter wavelengths, anode voltage must be reduced.
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