Tube-number record
YU-191A
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YU-191A is a tube type in the TubeDatabase archive (class: High-Mu Water Cooled Power Triode). Recorded specifications: brand Eimac, construction Triode, socket Coaxial, maximum plate voltage 5000 V, and maximum plate dissipation 7000 W. The archive does not yet hold a photographed example of this type.
BrandEimac
ClassHigh-Mu Water Cooled Power Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage5000 V
Plate Dissipation7000 W
Cathode Current2500 mA
Audio Performance
Key Features
- Ceramic/Metal construction
- Water cooled
- High-mu
- Zero grid bias operation potential
- Grounded grid operation compatible
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Radio Frequency Linear Amplifier Cathode Driven Class AB2 | 4900 V | — | — | 160 | 2250 mA |
| Radio Frequency Linear Amplifier Grid Driven Class AB2 | 4900 V | — | — | 160 | 1230 mA |
| Radio Frequency Power Amplifier Cathode Driven Class C | 4900 V | — | — | 160 | 2160 mA |
Application Notes
The YU-191A must be mounted vertically. High purity water must be used for cooling to minimize power loss and corrosion. Filament voltage should be maintained at 7.5V with maximum variations of 7.12 to 7.87V. Protective resistance of at least 10 ohms should be used in series with the anode.
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