811A tube specs

The 811A tube is a high-performance power triode designed for RF amplifier applications, featuring robust construction and reliable performance characteristics. Originally developed for demanding RF amplification needs, this versatile tube has become a standard in both commercial and amateur radio applications.

Its zero-bias operation capability and high power handling make it particularly suitable for linear amplifier designs. Known for its exceptional durability and consistent performance across varying operational conditions, the 811A has earned a reputation for reliability in continuous-duty applications where stable RF output is crucial. Here's a comprehensive overview of its key specifications:

Specification	Details
Filament Voltage	6.3V
Filament Current	4.0A
Plate Voltage (Max)	1500V
Plate Dissipation	65W
Grid-to-Plate Capacitance	5.5 pF
Grid-to-Filament Capacitance	5.5 pF
Plate-to-Filament Capacitance	0.8 pF
Maximum Frequency	30 MHz
Maximum Plate Current	175 mA
Amplification Factor	160
Base Type	Medium 4-pin
Cooling Method	Forced-air

811A tube data sheet download

Download our detailed 811A tube data sheet below for comprehensive technical specifications and operational parameters. This document includes complete characteristic curves, typical operating conditions, and maximum ratings to help you optimize your application.

Download 811A tube data sheet

Note: Technical specifications are provided for reference purposes only. For the most current information, always refer to the manufacturer's latest documentation.

811A tube substitute & equivalent information

Understanding compatible substitutes and equivalents is crucial for maintaining equipment functionality. The 811A tube equivalent options provide flexibility in various applications while maintaining performance standards.

Direct Substitutes:

811
811-A
572B (with slight modifications)

The 811A tube can be used as a replacement in equipment originally designed for:

810 tubes (with appropriate modifications)
812A tubes (in some applications)
T-160L (in certain RF applications)

When considering substitutions, it's important to note that while these tubes share similar characteristics, some modifications to operating parameters may be necessary. For optimal performance, consult with our experienced vacuum tube manufacturers to ensure compatibility with your specific application.

Common Applications:

RF power amplifiers
Linear amplifiers
Industrial RF heating equipment
Amateur radio transmitters
Broadcasting equipment

Operating Considerations:

Forced air cooling is recommended for optimal performance
Proper socket connections are crucial for safe operation
Filament voltage regulation helps extend tube life
Adequate warm-up time is necessary before applying plate voltage

The versatility and reliability of the 811A tube make it a popular choice across various applications. Whether you're maintaining existing equipment or building new projects, understanding the available substitutes ensures you can make informed decisions about your tube requirements.

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