Definitely sounds like something is damaged in the amp. It's hard to
say what without more diagnosis than can be covered here.
That "clicking" that you hear my be arcing. You want to STOP when you
hear that, as it will cause further damage inside the amp.
Sounds like you need to find someone with experience who can help you
troubleshoot the amp... or try Ameritron support, as Jim suggests.
73,
~iain / N6ML
On Fri, Aug 9, 2013 at 8:48 AM, John Shadle <sha...@katzenfisch.com> wrote:
> I should also note that sometimes the amp simply being powered on (not in
> OPER position, but just ON) has flipped my GFCI. This has happened a few
> times.
>
> So odd. And annoying, since my computer is also plugged in there--which
> requires a restart! ;-)
>
> -john W4PAH
>
>
> On Fri, Aug 9, 2013 at 11:46 AM, Jim Bennett <w6...@mac.com> wrote:
>
>> John -
>>
>> I've got an AL-811 but this (luckily) has not happened to me. I suggest a
>> call to Ameritron / MFJ, as it sounds like a component in the input
>> circuitry in the amp has gone flakey: able to withstand low amounts of RF
>> but fails under higher power. I had an issue with my AL-811 not being able
>> to load up on 80 meter CW - they were extremely helpful on the phone.
>>
>> Jim / W6JHB
>>
>>
>> On Aug 9, 2013, at 8:37 AM, John Shadle wrote:
>>
>> > Hi all,
>> > This could be tangentially related to a K3 issue, or maybe K3 experts can
>> > give some insight here. FYI, when I am not using the amp, I can get 100W
>> > from my K3 with no problem. Please keep reading...
>> >
>> > I have been using my AL-811 (not new, but new to me) successfully at 500W
>> > for the past few weeks. Recently (actually, the second time this has
>> > happened), my fuses both blew and I replaced them. Since I replaced them,
>> > behavior has not been typical. I can't get anything over 200W (most is in
>> > the 175W range). I use a tuner after the amp, and I know that the antenna
>> > is matched quite well to the amp, but my SWR meter on my rig (K3) is
>> > showing a high value.
>> >
>> > When I tune up at 20-25W I can get about 100W out from the amp. When I
>> move
>> > to 50-65W I get < 200W. And there is clicking. I can't tell if it's a
>> relay
>> > or if it's something else.
>> >
>> > So, the main issues are
>> > 1. High SWR from the rig to the amp (when the antenna is < 2:1 SWR to the
>> > amp)
>> > 2. Low power from the amp to the antenna
>> >
>> > Happy to provide other information if folks have ideas on where to look.
>> >
>> > Thanks.
>> > -john W4PAH
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