AL 811H SERVICE PDF

The ALH is a grounded grid linear Amplifier developed by Ameritron using low cost A power triodes. It operates in class AB2 for SSB. I’ve just been asked to fix an ALH by a local. but can’t find a Service Manual download anywhere (a main board layout would be useful). The ALH is rated at watts CW carrier in normal CW or tune. The AL is rated at watts PEP voice, or just over watts carrier.

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You may also like. What a horrible linear amplifier!

I haven’t confirmed this yet, as it’s really hard to get at the main board to test anything! Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems.

Many thanks for that Glen. Register for a free QRZ account.

After each modification the amplifier was firmly tested and plates never becames red. Terms and Conditions These terms and conditions contain rules about posting comments. Ameritron never published serice manuals for any of their amplifiers so they don’t exist.

However, it’s as if the Valves are getting no drive on Transmit. No wonder so many people on here are advised not to get one. Turn per band load and plate control clock and anti clockwise and watch if there is any anode or grid current.

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People who bought this also bought. A unique “buck-boost” winding allows adjustment of primary voltages to match a wide range of line voltages centered on and volts. I’d recommend this amp and I’ve owned many Check out other reviews on eHam Read full review Verified purchase: AC input power is removed from the transformer when the cover is removed. Hopefully it didn’t smoke the meter The administrator has the right to edit, move or remove any comment for any reason and without notice.

Page 1 of 1. Therefore, a sumiere test was done with the two types.

ALH Modifications

Irregularities in the schematic. Assembled 12v W 3.

W1QJAug 2, It transmits a clean signal, is easy to tune, and runs well from a VAC circuit, but is easily run on VAC as well. Two Illuminated Panel Meters: Connect the amplifier to a dummy load and adjust for maximum ouput.

Vernier Plate and Load Adjustments: In some cases, not as easily serviceable as they could have been, but then what is? That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer.

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Faulty Ameritron AL-811H

The A tubes are long life, reliable transmitting tubes. There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B. The drive level is detected to provide a control voltage for the exciter.

I’ve just been asked to fix an ALH by a local. Multi-voltage Heavy Duty Transformer: The suppression of the third- order harmonic is the difference between marker 3D and 4D. My preference would be given to the latter because I have more experience with it.

For half the price of a full, legal-limit amplifier, this amp is a great value and works well. The A tubes take approximately 10 seconds to warm-up. Lenovo MT Service Manual. AF6LJAug 2, This versatile Ameritron feature allows the user to maintain optimum voltages on the tubes and other components to obtain maximum performance and life.

I soldered this to the spot on the band-switch that hadn’t been soldered, and its been flawless since.

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