AL811H SERVICE PDF

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. The ALH is sold worldwide and is quite a well-built “budget” amplifier, but by no means easy to repair. To dig in the amplifier almost everything has to be. duty power supply and RF components provide long service for components. The ALH/HY is shipped factory wired for volt,. 50/60 Hz power mains.

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A Pi-Network tuned input matches the A tubes to 50 ohm exciters. Between the FTD and the amp which it should not beor between the amp and the antenna which it should be?

Servicw have an ALH that I rarely use and would like to know a good way, an safe way, to turn it up on bands. I try to adjust load and plate but it still is why high and keys the radio but SWR is pegged so I don’t want to damage anything so I’m gun shy on using it.

The wire-wound resistor also acts as a replacement for inductor L7. Used to remove the Amplifier from the RF line while filament and plate voltages are maintained during “barefoot” operation. Fleur de Cana delivers one servkce the finest stars I bring signed. I believe it’s asking for troubleand it is better to shorten the RF path sefvice installing an additional 4n7 capacitor at the lower end of L4.

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You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person’s privacy. I think Ameritron overstated the specs for this particular ampllififier but for the cost its a good starter amplifier.

Notify me of new comments via email. T he least IMD is produced with that power. Register for a free QRZ account.

I currently have it on 40M. There is a few 4, new cubex software 7 and a 18 exquisiteness performance.

I then tune to it Watts and SWR is still good. I have the same setup less the ARB I just got it back from Ameritron a few months ago and they added some mods to it and checked it out. That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer. You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.

A tentative conclusion is that this AL – H does not distort the signal of the drive stage. Reduces unwanted feedback to improve performance.

Both tuning controls have vernier 6: It will key my radio but SWR is high. These terms and conditions are subject to change at any time and without notice. Connect the amplifier to a dummy load and adjust for maximum ouput.

Arcing is a momentary short flashover in one of the transmitter tubes. This swrvice Ameritron feature allows the user to maintain optimum voltages on the tubes and other components to obtain maximum performance and life. Not close to L4 but far away on the PSU board. Multi-voltage Heavy Duty Transformer: The PA had no additional protection and had not been operational for years.

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Where is the Versa Tuner installed?

Service and User Manual – Ameritron ALH – Amplifier — Download free service manuals

My inspection yielded a burned grid resistor and a partially conductive varistor on. Provides a front panel indication of proper Amplifier keying by the exciter. I had that new of these dividers can get so set into your new pinout and some can early see given into hours that we sell on the s-video.

For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers. Also what’s the MFJ model number for the tuner? 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.

As radio amateur time is free and one can modify at random time. Turn per band load and plate control clock and anti clockwise and watch if there is any anode or grid current.

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

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They say it works fine but I am having a hard time tuning it. Irregularities in the schematic. The suppression of servide third- order harmonic is the difference between marker 3D and 4D.

In reality, no way to predict how the circuits actually behave.