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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Because there size s little space was to the valve sockets.

AMERITRON AL-811H Instruction Manual

I wouldn’t supersize that diode, it is a weak link for a reason as I understand it. A tentative conclusion is that this AL – H does not distort the signal of the drive stage. Mahual are regular discussions on forums about whether the A tubes can be better replaced by the more robust type B.

Turn per band load and plate control clock and anti clockwise and watch if there is any anode or ammeritron current. Many thanks for that Glen. Given its damage in the depicted tubeI think it’s caused by parasitic oscillationswhich led to a high voltage. No wonder so many people on here are advised not to get one.

That was not mahual diode I was thinking of. In some cases, not as easily serviceable as they could have been, but then what is?

The powerful spark induced scorching and inside a hole in the glass. Yah bigger is better. Can you site some issues you think are not good and how it can be improved. The wire-wound resistor also acts as a replacement for inductor L7.

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The size of the 10 m coil has become too small due to mounting method. What a horrible linear amplifier! I am wondering why you say the amp is awfully made. With this methodthe distance aameritron 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. I like TT gear in general, but their dual Z amp is about as “unserviceable” as any I’ve ever seen.

No the meters are both OK. Please note that ameriyron output in the table is partly achieved by exceeding the maximum grid and anode current.

After each modification the amplifier was firmly tested and plates never becames red. As radio amateur time is free and one can modify at random time. The suppression of the third- order harmonic is the difference between marker 3D and 4D.

ALH Modifications

For decadesI advise to mount a resistor and fuse in series with the anode choke as flash over protection for tubesrectifiers and transformers. I think it had a Valve flashover before I got it.

Register for a free QRZ account. This is a later model, by the way. The inductance of the long supply wires can not be ignored. The PA had no additional protection and had not been operational for years. I can hear at least one of the relays going over, but the SWR into the amp manhal very high. The shield of the cable also serves as a supply line to the central ground point in the tubes.



The Grid current meter was reading on transmit with no drive. G3YROAug 1, Roger, you must be the only person in your area that is willing to tackle ham wmeritron with problems. 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!

You must log in or sign up to reply here. Your name or email address: Irregularities in the schematic. I’m guessing it was designed at the Christmas party and they were all drunk. Hopefully it didn’t smoke the meter Flashover in a tube of an unprotected RF amplifier. Not close to L4 but far away on the PSU board.

My preference would be given to the latter because I have more experience with it.

Ameritron ALH Manuals

That ‘s nothing compared to a deceased tubediodes, or worse a faulty transformer. I don’t know what they were thinking.

Therefore, a sumiere test was done with the two types. I thought maybe the 2N had failed. Any suggestions would be welcome. On the other bandthe SWR will be high and is an internal tuner required for full ouput.

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