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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I thought maybe the 2N had failed. 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. The size of the 10 m coil has become too small due to mounting method. No wonder so many people on here are advised not to get one.

I haven’t confirmed this yet, as it’s really hard to get at the main board to test anything! I assume there are no professional repair people around.

Turn per band load and plate manuwl clock and anti clockwise and watch if there is any anode or grid current. Your name or email address: I’ve never seen one before. On the other bandthe SWR will be high and is an internal tuner required for full ouput.


Therefore, a sumiere test was done with the two types. G3YROAug 2, The suppression of the third- order harmonic is the difference between marker 3D and 4D. Ameritron never published service manuals for any of their amplifiers so they don’t exist. The shielding of the cable is only grounded at the side of C I’m guessing it was designed at the Christmas party and they were all drunk. This is a later model, by the way.

In some cases, al-811j as easily serviceable as they could have been, but then what is? It is a cheapsimple and proven effective method. After each modification the amplifier was firmly tested and plates never becames red.

You must log in or sign up to reply here. The PA had no additional protection and had not been operational for years.

Ameritron ALH Manuals

The wire-wound resistor also acts as a replacement for inductor L7. The shield of the cable also serves as a supply line to the central ground point in the tubes.

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However, it’s as if the Valves are getting no drive on Transmit. I wouldn’t ap-811h that diode, it is a weak link for a reason as I understand it. T he least IMD is produced with that power.

Not close to L4 but far away on the PSU board. Connect the amplifier to a dummy load and adjust for maximum ouput. What a horrible linear amplifier! AF6LJAug 2, That was not the diode I was thinking of. I am wondering why you say the amp is awfully made. That ‘s nothing compared to a deceased tubediodes, or worse a amsritron transformer.

Many thanks for that Glen. G3YROAug 1, Nanual it didn’t smoke the meter No the meters are both OK. Irregularities in the schematic.