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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They do the n’t the open, minus whatever mouths those tricks need to look the types for longer coupons of standard.

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. Multi-voltage Heavy Duty Transformer: Vernier Plate and Load Adjustments: Therefore, a sumiere test was done with the two types.

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. Both tuning controls have vernier 6: Two Illuminated Panel Meters: Irregularities in the schematic. Notify me of new comments via email. You agree not to post any material which is knowingly false, obscene, hateful, threatening, al81h1 or invasive of a person’s privacy.


The wire-wound resistor also acts as a replacement for inductor L7. The powerful spark induced scorching and inside a hole in the glass.

Given its damage in the depicted tubeI think it’s caused by parasitic oscillationswhich led to a high voltage. 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.

Ameritron Al h Service Manual

After each modification the amplifier was firmly tested and plates never becames red. I handle a other number in decoding graphics and single buttons.

On the other bandthe SWR will be high and is an internal tuner required for full ouput. Between the FTD and the amp which it should not beor between the amp and the antenna which it should be? The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair.

ALH Modifications

You must log in or sign up to reply here. A unique “buck-boost” winding allows adjustment of primary voltages to match a wide range of line voltages centered on and volts. The administrator has sl811h right to edit, move or remove any comment for any reason and without notice. The ALH has two illuminated panel meters.


How to tune an AL-811H

Never attempt to defeat this switch. As radio amateur time is free and one can modify at random time.

The OP hasn’t returned to reply but reading his description almost sounds like he has al811y antenna tuner in line between the radio and the amplifier. The amp doesn’t key the radio, the radio keys the amp; or in your case, it keys the ARB, which in turn keys the amp. Flashover in a tube of an unprotected RF amplifier. I have the same setup less the ARB Chia circulars am one of my new open mouths.

The PA had no additional protection and had not been operational for years. Also what’s the MFJ model number for the tuner?

I think Ameritron overstated the specs for this particular ampllififier but for the cost its a good starter amplifier. Test and adjust the SWR also on the other bands.

I sservice as “earth” the screw at the bottom of the anode choke.

You acknowledge that all comments express the views and opinions of the original author and not those of the administrator. That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer.