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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Ameriitron decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers.

I like TT gear in general, but their dual Z amp is about as “unserviceable” as any I’ve ever seen. 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.

I haven’t confirmed this yet, as it’s really hard to get at the main board to test anything! I am wondering why you say the manua, is awfully made. The suppression of the third- order harmonic is the difference between marker 3D and 4D.

G3YROAug 1, Irregularities in the schematic.

It is a cheapsimple mankal proven effective method. The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair.

ALH Modifications

I think it had a Valve flashover before I got it. The powerful spark induced scorching and inside a hole in the glass.

A tentative conclusion is that this AL – H does not distort the signal of the drive stage. There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B. This is a later model, by the way.


ZmeritronAug 2, Turn per band amsritron and plate control clock and anti clockwise and watch if there is any anode or grid current. That was not the diode I was thinking of. The size of the 10 m coil has become too small due to mounting method. No the meters are both OK.

The Ameritron amps I’ve seen aren’t poorly made. Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems. The Grid current meter was reading on transmit with no drive. The shielding of the cable is only grounded at the side of C Your name or email address: Not close to L4 but far away on the PSU board. Can you site some issues you think are not good and how it can be improved.


I’m guessing it was designed at the Christmas party and they were all drunk. Hopefully it didn’t smoke the al-811h I’ve never seen one before.

As radio amateur time is free and one can modify at random time. Yah mankal is better. In some cases, not as easily serviceable as they could have been, but then what is? Connect the amplifier to a dummy load and adjust for maximum ouput.

Ameritron ALH Manuals

Test and adjust the SWR also on the other bands. Therefore, a sumiere test amerigron done with the two types. The shield of the cable also serves as a supply line to the central ground point in the tubes. Arcing is a momentary short flashover in one of the transmitter tubes. I don’t know what they were thinking.


The inductance of the long supply wires can not be ignored. I wouldn’t supersize that diode, it is a weak link for a reason as I understand it. What a horrible linear amplifier! Any suggestions would be welcome. That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer. The long wire to be replaced by coaxial cable RGso that the length is converted into a small capacitance in parallel manial the load capacitor. 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.

Given its damage in the depicted tubeI think it’s caused by parasitic oscillationswhich led to a high voltage. I assume there are no professional repair people around. On the other bandthe SWR will be high and is an internal tuner required for full ouput.

You must log in or sign up to reply here. Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current. Flashover in a tube of an unprotected RF amplifier. Register for a free QRZ account. AF6LJAug 1, I’ve just been asked al-81h fix an ALH by a local.