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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This is a later model, by the way. Turn per band load and plate control clock and anti clockwise and watch if there is any anode or grid current.

It is a cheapsimple and proven effective method. On the other bandthe SWR will be high and wmeritron an internal tuner required for full ouput.

I thought maybe the 2N had failed.

I assume there are no professional repair manal around. Ameritron never published service manuals for any of their amplifiers so they don’t exist. I can hear at least one of the relays going over, but the SWR into the amp is very high.

Faulty Ameritron AL-811H

I’ve never seen one before. Test and adjust the SWR also on the other bands. That was not the diode I was thinking of. The shielding of the cable is only grounded at the side of C I think it had a Valve flashover before I got it.


G3YROAug 2, Hopefully it didn’t smoke the meter A tentative conclusion is that this AL – H does not distort the signal of the drive stage. The Ameritron amps I’ve seen aren’t poorly made. Not close to L4 but far away on the PSU board. Arcing is a momentary short flashover in one of the transmitter tubes.

Can you site some issues you manul are not good and how it amertron be improved. After each modification the amplifier was firmly tested and plates never becames red. Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems.

Faulty Ameritron ALH | QRZ Forums

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. No the meters are both OK.

AF6LJAug 2, Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current. However, here are photos of the circuit boards, one for the earlier version mamual one for the later version. I’ve just been asked to fix an ALH by a local. My inspection yielded a burned grid resistor and a partially conductive varistor on. I am wondering why you say the amp is awfully made.


Ameritron ALH Manuals

Flashover in a tube of an unprotected RF amplifier. I’m guessing it was designed at the Christmas party and they were all drunk. Yah bigger is better.

For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers. 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.

The size of the 10 m coil has become too small due to mounting method.