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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That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer. Your name or email address: Connect the amplifier to a dummy load and adjust for maximum ouput. Not close to L4 but far away on the PSU board. I’ve never seen one before.

On the other bandthe SWR will be high and is an internal tuner required for full ouput. The inductance of the long supply wires can not be ignored. I wouldn’t supersize that diode, it is a weak link for a manua as I understand it. W1QJAug 2, The suppression of the third- order harmonic is the difference between marker 3D and 4D.


Faulty Ameritron AL-811H

Turn per band load and plate control clock and anti clockwise and watch if there is any anode or grid current. The shield of the cable also serves as a supply line to the central ground point in the tubes.

I am wondering why you say the amp is awfully made. The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair.


Arcing is a momentary short flashover in one of the transmitter tubes. Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems.

Because there size s little space was to the valve sockets. Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current.

Can you site some issues you think are not good and how it can be improved. However, here are photos of the circuit boards, one for the earlier version and one for the later version.


Hopefully it didn’t smoke the meter Register for a free QRZ account. Many thanks for that Glen. G3YROAug 1, Irregularities in the schematic. I assume there are no professional repair people around.

ALH Modifications

My inspection yielded a burned amerjtron resistor and a partially conductive varistor on. The size of the 10 m coil has become too small due to mounting method.

Any suggestions would be welcome.

This is a later model, by the way. The Ameritron amps I’ve seen aren’t poorly made. I’m guessing it was designed at the Christmas party and they were all drunk.

AMERITRON AL-811H Instruction Manual

Flashover in a tube of an unprotected RF amplifier. 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. Therefore, a sumiere test was done with the two types.