ACT 26
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BrandMarconi
ClassTransmitting Triode
Construction
Primary TypeTriode
EnvelopeExternal Anode with Radiator
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage5000 V
Plate Dissipation5000 W
Cathode Current15000 mA
Audio Performance
Key Features
- Forced-air-cooled
- Thoriated tungsten filament
- Common grid circuits
- Frequency up to 300 Mc/s
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| VHF Amplifier | 2000V | 45000 | 490 | 22 | 1000mA |
Application Notes
Anode requires cooling by air blast of approx 300 cu. ft. per minute at 4-in head of water. Filament seals require 10 cu. ft. per minute. All cooling must start before supply voltages and continue for 30 seconds after removal. Frequency derating: 150MHz (80%), 200MHz (70%), 250MHz (60%), 300MHz (50%).
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