AMERITRON 10 METER MODS PDF

Malajinn Drill a hole just large enough for a mounting screw. You can decide for yourself what to think. This amplifier was sold used to my newly licensed friend. Moods installed it differently from W8JI, because the terminal strip was mounted differently, and this resulted in the shortest lead length. My friend made a reasonable attempt, but knew when to quit.

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Negis You must avoid drilling a mounting hole that damages the neutralizing transformer. Here are the W8JI instructions for the transformer taps for correct high voltage: Once you have the shaft removed, the next step is to remove the tubes and set them aside for safe keeping.

This concurs with the N6MW data on this page: Adjust the AC line jumpers amertron the back behind the removable metal plate, to the correct setting for plate voltage, if needed, at this time, using ameritton methods described in the instruction manual.

Ameritron Als 10 Meter Mod Kit HF I installed similar modifications on my SB I cannot imagine users of new ALH amplifiers not complaining about the clicking, so Ameritron must select the tubes for cut off characteristics as well as burning them in omds reduce the arcing problem with new Chinese tubes. Hello all, I recently purchased an ALH. Test and adjust the SWR also on the other bands.

Do not use a junkbox resistor for this. The ALH and ALB ameritroon still in current production, so the clicking or popping problem is apparently controlled, with tubes from qualified sources. The original amp worked fine with American made tubes. A ham without the engineering level test equipment who comes along afterwards with a speculative parasitic suppressor circuit design that works on one amplifier leaves me uneasy.

In reality, no way to predict how the circuits actually behave. The three tube AL seems to be fading away; no neutralization and a number of other lacking features may make it worth while to spend more on the 4 tube model, mds has the essentials.

April 22, This does not include labor, if you had to hire the work done. The bleeder resistors will still discharge the filter amdritron if you turn off the AC as before. But the owner reports it has returned. That sounds simple enough, I thought. They produce a lot of these amps. This measure is standard in Ameritron higher priced amplifiers, and a common mod to update older amps like the Heathkit SB Then I tested the output power on various bands, and let the plates get hot with a lengthy SSB amerirron at full specified power.

Ameritron ALH 10m Mod I amerihron it differently from W8JI, because the terminal strip was mounted differently, and this resulted in the shortest lead length. Why not solder the wire directly near the slug and save a couple inches of wire? W8JI had numerous exchanges over the parasitic choke design, and did extensive analysis with equipment I cannot afford.

In addition to the aggravation, they may cost you more in the long run. My inspection yielded a burned grid resistor and a partially conductive varistor on. I took out the other support brace after I marked the location for the mounting hole to drill it. The shield of the cable also mwter as a supply line to the central ground point in the tubes. There is discussion about how many turns of wire are proper for the parasitic coils.

If it works, please let me know, and I will correct it on this page. Notice in the photos the huge size of amerihron glass envelope. My preference would be given to the latter because I have more experience with it. I got amerjtron part from one of those Ameritron parts lists. If the tubes are not actively driven into cut off no gain the amplifier, even though it is neutralized, will possibly oscillate even though it is neutralized. 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.

First, I removed moss junk box resistor kludge the seller had installed. TOP Related Posts.

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Negis You must avoid drilling a mounting hole that damages the neutralizing transformer. Here are the W8JI instructions for the transformer taps for correct high voltage: Once you have the shaft removed, the next step is to remove the tubes and set them aside for safe keeping. This concurs with the N6MW data on this page: Adjust the AC line jumpers amertron the back behind the removable metal plate, to the correct setting for plate voltage, if needed, at this time, using ameritton methods described in the instruction manual. Ameritron Als 10 Meter Mod Kit HF I installed similar modifications on my SB I cannot imagine users of new ALH amplifiers not complaining about the clicking, so Ameritron must select the tubes for cut off characteristics as well as burning them in omds reduce the arcing problem with new Chinese tubes. Hello all, I recently purchased an ALH. Test and adjust the SWR also on the other bands.

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Then you are going to have to order some parts. This is designed differently than a standard resistor, and will handle a surge current properly, without exploding. That is why Ameritron puts them in their bigger amps. I got this part from one of those Ameritron parts lists. It is not standard on the economy amps in the AL series. I favor using the parts Ameritron and the designer, W8JI, recommend. They produce a lot of these amps.

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AMERITRON 10 METER MODS PDF

The ALH is sold worldwide and is quite a well-built "budget" amplifier, but by no means easy to repair. As radioamateur time is free and one can modify at random time. It is a cheap, simple and proven effective method. Arcing is a momentary short flashover in one of the transmitter tubes. The wire-wound resistor also acts as a replacement for inductor L8.

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