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 don’t know what they were thinking. However, it’s as if the Valves are getting no drive on Transmit. For decadesI advise to mount a resistor and fuse in ameritrron with the anode choke as flash over protection for tubesrectifiers and transformers.

Can you site some issues you think are not good and how amritron can be improved. That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer. The inductance of the long supply wires can not be ignored.

Therefore, a sumiere test was done with the two types. That was not the diode I was thinking of. Register for a free QRZ account.

AMERITRON AL-811H Instruction Manual

The powerful spark induced scorching and inside ameritrln hole in the glass. No wonder so many people on here are advised not to get one. I’m guessing it was designed at the Christmas party and they were all drunk. G3YROAug 1, No the meters are both OK. You must log in or sign up to reply here. AF6LJAug 1, I can hear at least one of the relays going over, but the SWR into the amp is very high.


The Grid current manula was reading on transmit with no drive. However, here are photos of the circuit boards, one for the earlier version and one for the later version. I’ve never seen one before.

Faulty Ameritron ALH | QRZ Forums

The Ameritron amps I’ve seen aren’t poorly made. K9STHAug 2, 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.

I am wondering why you say the amp is awfully made. Mnual 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. Ameritron never published service manuals for any of their amplifiers so they don’t exist.

Ameritron ALH Manuals

Yah bigger is better. The suppression of the third- order harmonic is the difference between marker 3D and 4D.


Test and adjust the SWR also on the other bands. Connect the amplifier to a dummy load and adjust for maximum ouput.

This is a later model, by the way. In reality, no way to predict how the circuits actually behave. The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair.


Flashover in a tube of an unprotected RF amplifier. In some cases, not as easily serviceable as they could have been, but then what is? Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current. I don’t know if there is even a “service” manual available for the ALH.

Not close to L4 but far away on the PSU board. T he least IMD is produced with that power.