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Faulty Ameritron ALH | QRZ Forums

AF6LJAug 2, I don’t know if there is even a “service” manual available for the ALH. Register for a free QRZ account.

Therefore, a sumiere test was done with the two types. I can hear at least one of the relays going over, but the SWR into the amp is very high. In some cases, not as easily serviceable as they could have been, but then what is? Ameritron never published service manuals for any ameritrpn their amplifiers so they don’t exist.

I’ve never seen one before. The long wire to be replaced by coaxial cable RGso that the length is converted into a small capacitance in al-811hh with the load capacitor.


What a horrible linear amplifier! I am wondering why you say the amp is awfully made. The Ameritron amps I’ve seen aren’t poorly made. I used as “earth” the screw at the bottom of the anode choke. That was not the diode I was thinking of. I thought maybe the 2N had failed. AF6LJAug 1, Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems. However, here are photos of the ameditron boards, one for the earlier version and one for the later version.

My preference would be given to the latter because I have more experience with manuak. 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.

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

The wire-wound resistor also acts as a replacement for inductor L7. However, it’s as if the Valves are getting no drive on Transmit.

K9STHAug 2, Yah bigger is better. The suppression of the third- order harmonic is the difference between marker 3D and 4D.

Al-811gAug 2, Flashover in a tube of an unprotected RF amplifier. Test and adjust the SWR also on the other bands. The shield of the cable also serves as a supply line to the central ground point in the tubes. Not close to L4 ameriton far away on the PSU board.


Faulty Ameritron AL-811H

There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B. In reality, no way to predict how the circuits actually behave. The Grid current meter was reading on transmit with no drive.

The energy could not leave via the high impedance of the plate circuitand so chose the shortest path via the tube. The powerful spark induced scorching and inside a hole in the glass. This is a later model, by the way. Can you site some issues you think are not good and how it can be improved.