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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T he least IMD is produced with that power.

In reality, no way to predict how the circuits actually behave. I think it had a Valve flashover before I got it. You must log in or sign up to reply here.

Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems. Therefore, a sumiere test was done with the two types.

This is a later model, by the way. The Grid current meter was reading on transmit with no drive. I haven’t confirmed this yet, as it’s really hard to get at the main board to test anything! The suppression of the third- order harmonic is the difference between marker 3D and 4D.

AMERITRON AL-811H Instruction Manual

If the PA is not used for a long time and goes back into a,eritronremove the fuse and let the amplifier an hour long stand idle. Can you site some issues you think are not good and how it can be improved. It is a cheapsimple and proven effective method. Turn per band load and plate control clock and anti clockwise and watch if there is any anode or grid current.

ALH Modifications

W1QJAug 2, I used as “earth” the screw at the bottom of the amnual choke. Ameritron never published service manuals for any of their amplifiers so they don’t exist. Flashover in a tube of an unprotected RF amplifier. I believe it’s asking for troubleand it is better to shorten the RF path by installing an additional 4n7 capacitor at the lower end of L4. The wire-wound resistor also acts as a replacement for inductor L7.


Because there size s little space was to the valve sockets.

I’ve just been asked to fix an ALH by a local. The energy could not leave via the high impedance of the plate circuitand so chose the shortest path via the tube. That ‘s nothing compared ameritrkn a deceased tubediodes, or worse a faulty transformer. Many thanks for that Glen.

For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers. In some cases, not as easily serviceable as they could have been, but then what is? I can hear at least msnual of the relays going over, but the SWR into the amp is very high.


The shield of the cable also serves as a supply line to the central al–811h point in the tubes. The shielding of the cable is only grounded at the msnual of C Hopefully it didn’t smoke the meter No the meters are both OK. I don’t know if there is even a “service” manual available for the ALH. Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current.

On the other bandthe SWR will be high and is an internal tuner required for full ouput. With this methodthe distance between S1 smeritron C26 changed to a small capacitance in parallel with the load capacitor and the total inductance of the coil 10 m is thereby reduced.


Yah bigger is better. K9STHAug 2, I am wondering why you say the amp is awfully made. The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair. Your name or email ameritrpn I’m guessing it was designed at the Christmas party and they were all drunk. The powerful spark induced scorching and inside a hole in the glass.

Not close to Akeritron but far away on the PSU board. However, here are photos of the circuit boards, one for the earlier version and one for the later version.

Arcing is a momentary short flashover in one of the transmitter tubes. No wonder so many people on here are advised not to get one. That was not the diode I was thinking of.

The Ameritron amps I’ve seen aren’t manua, made. The size of the 10 m coil has become too small due to mounting method. However, it’s as if the Valves are getting no drive on Transmit.

Connect the amplifier to a dummy load and adjust for maximum ouput. The PA had no additional protection and had not been operational for years. AF6LJAug 2, I’ve never seen one before.

Register ameritro a free QRZ account. As radio amateur time is free and one can modify at random time.