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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Given its damage in the depicted tubeI think it’s caused by parasitic oscillationswhich led to a high voltage.

Flashover in a tube of an unprotected RF amplifier. The shielding of the cable is only grounded at the side of C Any suggestions would be welcome. No al-8111h so many people on here are advised not to get one.

I assume there are no professional repair people around. The Ameritron amps I’ve seen aren’t poorly made. Therefore, a sumiere test was done with the two types.

Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current. In some cases, not as easily serviceable as they could have been, but then what is?

ALH Modifications

The Grid current meter was reading on transmit with no drive. No the meters are both OK. Hopefully it didn’t smoke the meter Because there size s little space was to the valve sockets. Turn per band load and plate control clock and anti clockwise and watch if there is any anode xmeritron grid current.


However, it’s as if the Valves are getting no drive on Transmit. I’ve never seen one before. Can you site some issues you think are not good and how it can be improved. 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.

The suppression of the third- order harmonic is the difference between marker 3D and 4D. 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 think it had a Valve flashover before I got it. The energy could not leave via the high impedance of the plate circuitand so chose the shortest path via the tube.

Connect the amplifier to a dummy load and adjust for maximum ouput. There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B. That was not the diode I was thinking of. I wouldn’t supersize that diode, it is a weak link for a reason as I understand it. This is a later model, by the way. G3YROAug 2, The inductance of the long supply wires can not be ignored. I’m guessing it was designed at the Christmas party and they were all drunk.

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T he least IMD is produced with that power. What a horrible linear amplifier! Your name or email address: I am wondering why you say the amp is awfully made.

On the other bandthe SWR will be high and is an internal tuner required for full ouput. That ‘s manyal compared to a deceased tubediodes, or worse a faulty transformer.


K9STHAug 2, The wire-wound resistor also acts as a replacement for inductor L7. Ameritron never published service manuals for any of their amplifiers so they don’t exist.

I like TT gear in general, but their dual Z amp is about as “unserviceable” as any I’ve ever seen. A tentative conclusion is that this AL – H does not distort the signal of the drive stage. AF6LJAug 1,

Last modified: May 25, 2020