75TL
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BrandEimac
ClassTransmitting Triode
BaseMedium 4-pin bayonet, ceramic, RMA type M8-078
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialCeramic
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation75 W
Cathode Current225 mA
Audio Performance
Power Output350 W
Key Features
- Low-mu
- High-vacuum
- Radiation cooled plate
- Visibly red temperature plate operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class-C Telegraphy | 1000V | 3350 | - | 12 | 215mA |
| Class-C Telegraphy | 1500V | 3350 | - | 12 | 167mA |
| Class-C Telegraphy | 2000V | 3350 | - | 12 | 150mA |
| Class-B Audio (Two Tubes) | 1000V | - | 5300 | 12 | 350mA |
| Class-B Audio (Two Tubes) | 1500V | - | 11000 |
Application Notes
The 75TL must be mounted vertically, base up or base down. Flexible connecting straps should be provided between the grid and plate terminals and the external circuits. The plate operates at a visibly red temperature at maximum dissipation.
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