75TH
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BrandEimac
ClassTransmitting Triode
BaseMedium 4-pin bayonet, ceramic, RMA type M8-078
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation75 W
Cathode Current225 mA
Audio Performance
Power Output300 W
Key Features
- Medium-mu
- High-vacuum
- Radiation cooled plate
- Thoriated tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class-C Telegraphy | 1000V | 4150 | - | 20 | 215mA |
| Class-C Telegraphy | 1500V | - | - | - | 167mA |
| Class-C Telegraphy | 2000V | - | - | - | 150mA |
| Class-B Audio (Two Tubes) | 1000V | - | - | - | 350mA |
| Class-B Audio (Two Tubes) | 1500V | - | - |
Application Notes
The Eimac 75TH is a medium-mu transmitting triode intended for amplifier, oscillator, and modulator service. Plate operates at a visibly red temperature at maximum dissipation.
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