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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The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair. Register for a free QRZ manusl. The inductance of the long supply wires can not be ignored.

You must ameritrin in or sign up to reply here. There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B.


My preference would be given to the latter because I have more experience with amerigron. I’ve just been asked to fix an ALH by a local. 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.


I thought maybe the 2N had failed. I don’t know if there is even a “service” manual available for the ALH.

AMERITRON AL-811H Instruction Manual

Arcing is a momentary short flashover in one of the transmitter tubes. The Ameritron amps I’ve seen aren’t poorly made. The shield of the cable also serves as a supply line to the central ground point in ameritrpn tubes. 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.

It is a cheapsimple and proven effective method. K9STHAug 2, No wonder so many people on here are advised not to get one. 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.

I don’t know what they were thinking.


Flashover in a tube of an unprotected RF amplifier. AF6LJAug 1, The energy could not leave via the high impedance of the plate circuitand so chose the shortest path via the tube.

Ameritron never published service manuals for any of their amplifiers so they don’t exist. The shielding of the cable is only grounded at the side of C I am wondering why you say the amp is awfully made. For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubes manusl, rectifiers and transformers. I’ve never seen one before.


Faulty Ameritron ALH | QRZ Forums

That was not the diode I was thinking of. Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems. With this methodthe distance between S1 and C26 changed to a small capacitance in parallel with the load capacitor and the total inductance of the coil 10 m is thereby reduced. Connect the amplifier to a dummy load and adjust for maximum ouput.

What a horrible linear amplifier! This is a later model, by the way. After each modification the amplifier was firmly tested and plates never becames red. Any suggestions would be welcome.

That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer.