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. I think it had a Valve flashover before I got it. I thought maybe the 2N had failed.

The suppression of the third- order harmonic is the difference between marker 3D and 4D. W1QJAug 2, G3YROAug 2, The shielding of the cable is only grounded at the side of C In some cases, not as easily serviceable as they could have been, but then al-811b is? Roger, you must be the only person in your area that is willing ameriteon tackle ham amplifiers with problems.


My inspection yielded a burned grid resistor and a partially conductive varistor on. I don’t know if ameritrno is even a “service” manual available for the ALH. T he least IMD is produced with that power. I’m guessing it was designed at the Christmas party and they were all drunk.

Faulty Ameritron AL-811H

No wonder so many people on here are advised not to get one. G3YROAug 1, Flashover in a tube of an unprotected RF amplifier. That was not the diode I was maanual of. Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current. I haven’t janual this yet, as it’s really hard to get at the main board to test anything! Hopefully it didn’t smoke the meter I like TT gear in general, but their dual Z amp is about as “unserviceable” as any I’ve ever seen.


A tentative conclusion is that this AL – H does not distort the signal of the drive stage.

Register for a free QRZ account. My preference would be given to the latter because I have more experience with it.


The wire-wound resistor also acts as a replacement for inductor L7. The PA had no additional protection and had not been operational for years. I used as “earth” the screw at the bottom of the anode choke.

However, it’s as if the Valves are getting no drive on Transmit. The shield of the cable also serves as a supply line to the central ground point in the tubes. On the other bandthe SWR will be high and is an internal tuner required for full ouput.

It is a cheapsimple and proven effective method.

Faulty Ameritron ALH | QRZ Forums

The long wire to be replaced by coaxial cable RGso that the length is converted into a majual capacitance in parallel with the load capacitor. For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers.


I assume there are no professional repair people around. Your name or email address: Irregularities in the schematic. 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. Given its damage in the depicted tubeI think it’s caused by parasitic oscillationswhich led to a high voltage. The inductance of the long supply wires can not be a-l811h. No the meters are both OK. Because there size s little space was to the valve sockets. I’ve never seen one before.

AF6LJAug 1, Yah bigger is better.

The Ameritron amps I’ve seen aren’t poorly made. Can you site some issues you think are not good and how it can be improved. The powerful spark induced scorching and inside a hole in the glass.