Tube-number record
CAT 26
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BrandMarconi
ClassHigh Power Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeWater-cooled anode
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage12000 V
Plate Dissipation12000 W
Grid 1 Voltage-1500 V
Cathode Current15000 mA
Audio Performance
Key Features
- Water cooled anode
- Thoriated tungsten filament
- Designed for communications or RF heating
- HF amplifier up to 40 Mc/s
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF Power Amplifier Class C Telegraphy | 12000 V | 9500 | 4750 | 45 | 3000 mA |
| HF Power Amplifier Class C Telegraphy | 8000 V | 9500 | 4750 | 45 | 2900 mA |
| HF Power Amplifier Class C Anode Modulated | 10000 V | 9500 | 4750 | 45 |
Application Notes
Cooling water flow must not be less than 3 gallons per minute. Outlet water temperature must not exceed 65°C. Seasoning required after 2 months idle. HT voltage above 7 kV must be increased gradually.
Datasheets
Datasheet: CAT26.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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