The ALH is a grounded grid linear Amplifier developed by Ameritron using low cost A power triodes. It operates in class AB2 for SSB. I’ve just been asked to fix an ALH by a local. but can’t find a Service Manual download anywhere (a main board layout would be useful). The ALH is rated at watts CW carrier in normal CW or tune. The AL is rated at watts PEP voice, or just over watts carrier.
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Show More Show Less. The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair.
People who bought this also bought. The shielding of the cable is only grounded at the side of C Can you site some issues you think are not good and how it can be improved. I don’t know if there seervice even a “service” manual available for the ALH. Multi-voltage Heavy Duty Transformer: I used as “earth” the screw at the bottom of the anode choke.
Failure to 81h1 with these rules may result in being banned from further commenting. By submitting a comment, you are declaring that you agree with these rules: I’ve just been asked to fix an ALH by a local.
However, here dervice photos of the circuit boards, one for the earlier version and one for the later version.
I haven’t confirmed this yet, as it’s really hard to get at the main board to test anything! The wire-wound resistor also acts as a replacement for inductor L7. Many thanks for that Glen.
It transmits a clean signal, is easy to tune, and runs well from a VAC circuit, but is easily run on VAC as well. I wouldn’t 8111h that diode, it is a weak link for a reason as I understand it. These terms and conditions contain rules about posting comments.
On the other bandthe SWR will be high and is an internal tuner required for full ouput. G3YROAug 1, Flashover in a tube of an unprotected RF amplifier. Roger, you must be xervice only person in your area that is willing to tackle ham amplifiers with problems.
I can hear at least one of the relays going over, but the SWR into the amp is very high. Register for a free QRZ account.
K9STHAug 2, Any suggestions would be welcome. Save on Ham Radio Amplifiers Trending price is based on prices over last 90 days. However, it’s as if the Valves are getting no drive on Transmit. Your name or email address: The inductance of the long supply wires can not be ignored.
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The powerful spark induced scorching and inside a hole in the glass. The suppression of the third- order harmonic is the difference between marker 3D and 4D. Assembled 12v W 3. By submitting a comment, you are declaring that you agree with these rules:. Servjce MT Service Manual. Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time. That was not the diode I was thinking of. A tentative conclusion is that this AL – H does 81h distort the signal of the drive stage.
Service and User Manual – Ameritron ALH – Amplifier — Download free service manuals
AC input power is removed from the transformer when the cover is removed. No wonder so many people on here are advised not to segvice one. It is a cheapsimple and proven effective method. Irregularities in the schematic. The drive level is detected to provide a control voltage for the exciter.
Ameritron Al-811h 800w Ham Amateur Radio HF Linear Amplifier
The shield of the cable also serves as a supply line to the central ground point in the tubes. Reduces unwanted feedback to improve performance.
811y Yamaha TF1 Service Manual. Who knows how long the supply of tubes will last, but, for now at least, this isn’t a problem. Other Ham Radio Equipment.