Ameritron AL-811 and AL-811H HF Amplifier Information
Find manuals, modifications, troubleshooting guides, and reviews for the Ameritron AL-811 and AL-811H HF linear amplifiers.
The Ameritron AL-811 and AL-811H are popular HF linear amplifiers, widely used by hams to boost their signal on the amateur radio bands. These amplifiers typically use 811A or 572B vacuum tubes to achieve power outputs of 600 to 800 watts, making them suitable for DX operation, contesting, and improving signal reports during everyday QSOs. Operators often choose these models for their balance of performance and affordability, integrating them into their stations for a significant increase in transmit power.
Many resources are available for operators looking to maintain, modify, or troubleshoot their AL-811 series amplifiers. This includes official owner's manuals and detailed guides for common modifications, such as extending operation to the 10 and 12-meter bands. Hams can also find solutions for typical issues like burnt-out panel meter lights or high SWR after modifications. Discussions and articles cover tube selection and replacement, along with advice on proper tuning and driving of the amplifier to ensure optimal performance and longevity.
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10 meter modification for the Ameritron AL-811 and AL-811H amplifier. This mod apply to other Ameritron AL Series RF amplifiers and allow extension to 10 and 12 meters band. -
Pictures of the Ameritron AL-811 modification for 10 meter band extension by km5ps -
A solutiom for the Ameritron AL-811(H) RF power amplifier, burnt panel meter lights. A common failure with the Ameritron AL-811 and similar amplifiers is that the panel meter lights burn out prematurely. These bulbs are usually integrated into the actual panel meter. The solution for this is to provide the meter backlighting with LEDs. -
eHam reviews for the Ameritron AL-811 linear amplifier -
This article examines the performance of the Ameritron AL-811H amplifier with the supplied 811A tubes and with 572B tubes, and details a procedure for replacement of existing tubes. -
AL-811 and AL-811H specifications and information about this 600-800 Watt ham radio ower amplifiers -
Are you experiencing very high SWR with the 10M Modification to Ameritron AL-811 amplifier ? This is a good forum topic to fix this problem. -
Discussion on how properly drive and tune athe Ameritron AL-811 power amplifier -
Ameritron AL80B AL811H AL572 Amplifier Trouble Shooting. Tubes replacement, resistor changes.