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’m guessing it was designed at the Christmas party and they were all drunk. This is a later model, by the way. I don’t know what they were thinking.
Ameritron ALH Manuals
Arcing is a momentary short flashover in one of the transmitter tubes. Yah bigger is better.
I think it had a Valve flashover before I got it. The wire-wound resistor also acts as a replacement for inductor L7. Many thanks for that Glen. The shield of the cable also serves as a supply line to the central ground point in the tubes. It is al-81h cheapsimple and proven effective method.
After each modification the amplifier was firmly tested and plates never becames red. No wonder so many people on here are advised not to get one. I’ve never seen one before. 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.
You must log in or sign up to reply here. The Grid current meter was reading on transmit with no drive.
I don’t know if there is even a “service” manual available for the ALH. There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B.
AMERITRON AL-811H Instruction Manual
AF6LJAug 1, As radio amateur time is free and one can modify at random time. However, it’s as if the Valves are getting no drive on Transmit. Your name or email address: A tentative conclusion is that this AL – H does not distort the signal of the drive stage. Because there size s little space was to the valve sockets.
AMERITRON ALH INSTRUCTION MANUAL Pdf Download.
However, here are photos of the circuit boards, one for the earlier version and one for the later version. Hopefully it didn’t smoke the meter Not close to L4 but far away on the PSU board. I can hear at least one of the relays going over, but the SWR into the amp is very high. My inspection yielded a burned grid resistor and a partially conductive varistor on. Please note that the output in the table is partly achieved by exceeding the maximum grid and anode current.
The long wire to be replaced by coaxial cable RGso that the length is converted into a small capacitance in parallel with the load capacitor. I wouldn’t supersize that diode, it is a weak link for a reason as I understand it.
Faulty Ameritron AL-811H
Connect the amplifier to a dummy load and adjust for maximum ouput. G3YROAug 2, 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. I believe it’s asking for troubleand it is better to zmeritron the RF path by installing an additional 4n7 capacitor at the lower maeritron of L4.