AL 811H SERVICE PDF

What a horrible linear amplifier! However, here are photos of the circuit boards, one for the earlier version and one for the later version. Free Service Manuals The shield of the cable also serves as a supply line to the central ground point in the tubes. Failure to comply with these rules may result in being banned from further commenting.

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Long Tube Life: The A tubes are long life, reliable transmitting tubes. The Grid Current meter provides a continuous reading of the A grid current to indicate proper loading of the Amplifier. Multi-voltage Heavy Duty Transformer: A unique "buck-boost" winding allows adjustment of primary voltages to match a wide range of line voltages centered on and volts.

This versatile Ameritron feature allows the user to maintain optimum voltages on the tubes and other components to obtain maximum performance and life.

Vernier Plate and Load Adjustments: Both tuning controls have vernier reduction drives for smooth tuning logging scales for accurate and rapid tune-up. Safety interlock: AC input power is removed from the transformer when the cover is removed. Never attempt to defeat this switch. ALC: The drive level is detected to provide a control voltage for the exciter. ALC prevents over-driving of the linear and reduces distortion from excessive drive power.

Neutralization Circuit: Reduces unwanted feedback to improve performance.

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AMERITRON AL-811H Instruction Manual

Free Service Manuals By submitting a comment, you are declaring that you agree with these rules: The long wire to be replaced by coaxial cable RGso that the length is converted into a small capacitance in parallel with the load capacitor. I have read and agree to the terms and conditions. This versatile Ameritron feature allows the user to maintain optimum voltages on the tubes and other components to obtain maximum performance and life. Notify me of new comments via email. The powerful spark induced scorching and inside a hole in the glass. Then figure out how to connect it all up properly and try again. Darren, Check out this link http: If the PA is not used for a long time and goes back into operation al81h, remove the fuse and let the amplifier an hour long stand idle.

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AL 811H SERVICE PDF

Long Tube Life: The A tubes are long life, reliable transmitting tubes. The Grid Current meter provides a continuous reading of the A grid current to indicate proper loading of the Amplifier. Multi-voltage Heavy Duty Transformer: A unique "buck-boost" winding allows adjustment of primary voltages to match a wide range of line voltages centered on and volts. This versatile Ameritron feature allows the user to maintain optimum voltages on the tubes and other components to obtain maximum performance and life.

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AL811H SERVICE PDF

Not close to L4 but far away on the PSU board. The suppression of the third- order harmonic is the difference between marker 3D and 4D. My inspection yielded a burned grid resistor and a partially conductive varistor on. ALC prevents over-driving of the linear and reduces distortion from excessive drive power. In reality, no way to predict how the circuits actually behave. However, here are photos of the circuit boards, one for the earlier version and one for the later version. Irregularities in the schematic.

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