[Hammarlund] Hammarlund HX-500 problems

[Kenneth G. Gordon]

Everything Chuck says here is absolutely correct. So...do them.

Also, and in addition, I have found both electrolytic caps and diodes 
LABELED backwards from the manufacturer.

If you haven't got shorted turns in the transformer, then I would almost bet 
that you have installed at least one of the replacement caps backwards.

Ken W7EKB

On 29 Apr 2013 at 13:19, Charles Ochs wrote:

> I think you are going down the wrong path here. The tip-off was "blows
> 6 amp fuse after a minute". This obviously indicates that something in
> the transmitter (somewhere) is drawing excessive current. This is a
> very dangerous situation, and you should NOT run the thing for long
> until you have located the problem. Get an ammeter in line with the AC
> input so that you can constantly monitor line current. A 10 amp meter
> will do fine. Pull ALL of the rectifier tubes, and turn the beast on.
> A variac would be very helpful here, as you could then back off the
> voltage if you see something "bad" happening. It is very possible that
> you have a bad power transformer, probably a few shorted turns in the
> primary, and this test will determine if this is so. If you can run
> the set with the rectifier tubes removed indefinitely without drawing
> excessive current, than the transformer is probably OK. Count your
> blessings, and move on. Replaced a lot of electrolytics, you say? Did
> you use NEW ones? Are any in backwards? Did you test them before
> installation? I have known even brand new caps to be shorted. Rare,
> but it happens. Start here. Then, get back to us! Chuck N1LNH
> 
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Kenneth G. Gordon W7EKB

"Courage is being scared to death but saddling up anyway."--- John   Wayne