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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 don’t know what they were thinking. The size of the 10 m coil has become too small due to mounting method.
Faulty Ameritron ALH | QRZ Forums
ameriton As radio amateur time is free and one can modify at random time. Can you site some issues you think are not good and how it can be improved. The powerful spark induced scorching and inside a hole in the glass. Arcing is a momentary short flashover in one of the transmitter tubes. The Grid current meter was reading on transmit with no drive.
No wonder so many people on here are advised not to get one. Roger, you must be the only person in your area that is willing to tackle ham amplifiers with problems.
Any suggestions would be welcome. AF6LJAug 1, I wouldn’t supersize that diode, it is a weak link for a reason as I understand it. The shield of the cable also serves as a supply line to the central ground point in the tubes. T he least IMD is produced with that power.
I like TT gear in general, but their dual Z amp is about as “unserviceable” as any I’ve ever seen. The AL- H is sold worldwide and is quite a well-built “budget” amplifierbut by no means easy to repair.
Given its damage in the depicted tubeI think it’s caused by parasitic oscillationswhich led to a high voltage. Irregularities in the schematic.
AMERITRON AL-811H Manuals
Yah bigger is better. I believe ameritrln asking for troubleand it is better to shorten the RF path by installing an additional 4n7 capacitor at the lower end of L4. After mamual modification the amplifier was firmly tested and plates never becames red. 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. For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers.
G3YROAug 1, I assume there are no professional repair people around. Ameritron never published service manuals for any of their amplifiers so they don’t exist. I’ve never seen one before. The Ameritron amps I’ve seen aren’t poorly made. Hopefully it didn’t smoke the meter However, it’s as if the Valves are getting no drive on Transmit. In reality, no way to predict how the circuits actually behave.
The PA had no additional protection and had not been operational for years. The energy could not leave via the high impedance of the plate circuitand so chose the shortest path via the tube.
K9STHAug 2, Because there la-811h s little space was to the valve sockets. The wire-wound resistor also acts as a replacement for inductor L7. There are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B. However, here are photos of the circuit boards, one for the earlier version and one for the later version. I’m guessing it was designed at the Christmas party and they were all drunk.
Ameritron ALH Manuals
I haven’t confirmed this yet, as it’s really hard to get at the main board to test anything! I think it had a Valve flashover before I got it.
I thought maybe the 2N had failed. The suppression of the third- order harmonic is the manuual between marker 3D and 4D.
Not close to L4 but far away on the PSU board. I used as “earth” the screw at the bottom of the anode choke. With this methodthe distance between S1 and C26 changed to a small capacitance in parallel with the load capacitor and the total inductance amertiron the coil 10 m is thereby reduced.
The inductance amdritron the long supply wires can not be ignored. Many thanks for that Glen. Connect the amplifier to a dummy load and adjust for maximum ouput.
I am wondering why you say the amp is awfully made.