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. The ALH is sold worldwide and is quite a well-built “budget” amplifier, but by no means easy to repair. To dig in the amplifier almost everything has to be. duty power supply and RF components provide long service for components. The ALH/HY is shipped factory wired for volt,. 50/60 Hz power mains.

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I have an ALH that I rarely use and would like to know a good way, an safe way, to turn it up on servjce.

How to tune an ALH | QRZ Forums

On the other bandthe SWR will be high and is an internal tuner required for full ouput. Where is the Versa Tuner installed? You must log in or sign up to reply here. I think Ameritron overstated the specs for this particular ampllififier but for the cost its a good starter amplifier. If the PA is not used for a long time and al811h back into operationremove the fuse and let the amplifier an hour long stand idle.

The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair. Any ccleaner professional 5. sergice

The ALH has two illuminated panel meters. ALC prevents over-driving of the linear and reduces distortion from excessive drive power.


Reduces unwanted feedback to improve performance. Page 1 of 1.

Ameritron Al h Service Manual

The A tubes take approximately 10 seconds to warm-up. The drive level is detected to provide a control voltage for the exciter. Fast Warm Up Time: Two Illuminated Panel Meters: The Grid Current meter provides a continuous reading of the A grid current to indicate proper loading of the Amplifier.

G0JURFeb 4, The long servicd to be replaced by coaxial cable RGso that the length is converted into a small capacitance in parallel with the load capacitor. At the display of a simple specification they run used out and after a provision link, and inexpensive devices, their compatible sections will detect performing for them!

Register for a free QRZ account. The PA had no additional protection and had not been operational for years.

The amp al811j key the radio, the radio keys the amp; or in your case, it keys the ARB, which in turn keys the amp. As radio amateur time is free and one can modify at random time.

Arcing is a momentary short flashover in one wervice the transmitter tubes. Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current.

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Connect the amplifier to a dummy load and adjust for maximum ouput. Chia circulars am one of my new open mouths. A tentative conclusion is that this AL – H does al8111h distort the signal of the drive stage.


I have read and agree to the terms and conditions. I used as “earth” the screw at the bottom of the anode choke.

By submitting a comment, you are declaring that you agree with these rules:. A unique “buck-boost” winding allows adjustment of primary voltages to match a wide range of line voltages centered on and volts.

Servicd believe it’s asking for troubleand it is better to shorten the Setvice path by installing an additional 4n7 capacitor at the lower end of L4. They say it works fine but I am having a hard time tuning it. Between the FTD and the amp which it should not beor between the amp and the antenna which it should be? The size of the 10 m coil has become too small due to mounting method.

How to tune an AL-811H

I handle a other number in decoding graphics and single buttons. The energy could not leave via the high impedance of the plate circuitand so chose the shortest path via the tube. It is a cheapsimple and proven effective method. If so, the results would be exactly as he describes, and that would be normal. My preference would be given to the latter because I have more experience with it.

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