>Greetings.
>I searched the archives (by Subject field) and didn't find anything
>about the Amp Supply LK500ZA. I purchased this amp Saturday from a
>dealer at a swapfest for $600. The main reason I got it was to have
>something for 160M, which my L4 doesn't cover.
The fixed padder capacitors in the LK500 tank are not designed to handle
RF current.
>It is putting out about
>1100 watts on CW, which is fine with me. However, it sure does seem to
>me to be running hot. The cabinet gets very hot very quickly. I have
>been in the habit of placing a 5" muffin fan (exhausting upward) on top
>of the cabinet (over the tubes) of various gear in the past (S-line,
>30L1, SB200, Warrior, etc) and that always made the cabinets quite cool,
>but it is helping little if any in this case. There doesn't seem to be
>a lot of airflow coming out the side of the cabinet, either, although I
>can hear the internal muffin fan running. Has anyone else had this
>experience with this amp? I just wonder if the internal fan may need to
>be replaced.
>
I repaired one that suffered from intermittent parasitic arcing. The
ball bearings in the internal fan had flat spots.
>Also, are there any mods documented anywhere for this amp?
I have not seen an article on the LK500.
>I don't
>intend to rebuild it or do anything major, but if there are any major
>design flaws that are simple to fix, or anything to watch out for, I
>would like to know.
Better parasitic suppressors, glitch protection and high-speed switching
are the only mods I know about.
>I will mostly be using the amp for DXing plus
>occasional contesting, though I will drop the power a bit for any
>extended duty cycling. (The amp does not have the QSK or external
>Hypersil transformer options). Also, does anyone have a manual that
>they might be able to copy a few pages of for me? I got a copy of a
>manual with it, but after getting it home I notice that there are some
>pages missing. Thanks!
>
You probably need a copy of the diagram. The rest is of lesser value.
Rich---
R. L. Measures, 805-386-3734, AG6K
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