View and Download AMERITRON ALH instruction manual online. HF POWER LINEAR AMPLIFIER. ALH Amplifier pdf manual download. Manuals and User Guides for AMERITRON ALH. We have 1 AMERITRON ALH manual available for free PDF download: Instruction Manual. Download AMERITRON ALH 1,,5MHZ LINEAR AMPLIFIER SM service manual & repair info for electronics experts.

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I’ve never wmeritron one before. I don’t know if there is even a “service” manual available for the ALH. However, here are photos of the circuit boards, one for the earlier version and one for the later version.

Ameritron never published service manuals for any of their amplifiers so they don’t exist. AF6LJAug 2, W1QJAug 2, What a horrible linear amplifier!

Hopefully it didn’t smoke the meter I believe it’s asking for troubleand it is better to shorten the RF path by installing an additional 4n7 capacitor at the lower end of L4. Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems. G3YROAug 2, The suppression of the third- order harmonic is the difference between marker 3D and 4D. Can you site some issues you think are not good and how it can be improved.


I think it had a Valve flashover before I got it.

After each modification the amplifier was firmly tested and plates never becames red. A tentative conclusion is that this AL – H does not distort the signal of the drive stage. Your name or email address: The Ameritron amps I’ve seen aren’t poorly made.

AMERITRON AL-811H Instruction Manual

On the other bandthe SWR will be high and is an internal tuner required for full ouput. Given its damage in the depicted tubeI think it’s caused by parasitic oscillationswhich led to a high voltage. Turn per band load and plate control clock and anti clockwise and watch if there is any anode or grid current. Connect the amplifier to a dummy load and adjust for maximum ouput.

My inspection yielded a burned grid resistor and a partially conductive varistor on. I wouldn’t supersize that diode, it is a weak link for amerifron reason as I xl-811h it.

The wire-wound resistor also acts as a replacement for inductor L7. The shield of the cable also serves as a supply line to the central ground point in the tubes. If the PA is not used for a long time and goes back into operationremove the fuse and let the amplifier an hour long stand idle. It is a cheapsimple and proven effective method.


In some cases, not as easily serviceable manuual they could have been, but then what is? That was not the diode I was thinking of.


I like TT gear in general, but their dual Z amp is about as “unserviceable” as any I’ve ever seen. There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B.

I am wondering why you say the amp is awfully made. T he least IMD is produced with that power. I’m guessing it was designed at the Christmas party and they were all drunk.

ALH Modifications

Yah bigger is better. You must log in or sign up to reply here. Any suggestions would be welcome. Therefore, a sumiere test was done with the two types.