David, like bringing up any long dormant hardware, it is best to not try
to do 'top speed' right out of the storage box. Turn on a long dormant
power supply and let it run all day to reform the electrolytic
capacitors. Then load it with its normal loads.
If you have a supply running a receiver, you might let it be online and
that gives you a way to evaluate if the supply has excessive hum from
long storage. As the capacitors reform, the hum should reduce. Hooked
up as an AM receiver, this would be easy to judge.
If you have a transmitter, run it awhile to warm up (reform), and then
don't load up to maximum power until you are sure the supply is
producing correct voltage, and the load current is not excessive.
Capacitors internal to the receiver will need to reform just as those in
the external supplies will.
It is good practice to open up equipment long stored and make sure there
really has been no critters working inside. Use a high intensity light
to look for any dormant problems in the making. It is not unusual to
have coupling capacitors start to fail, by bulging their contents out
the ends, or have electrolyte spill from vents of an electrolytic and
such a pre-operation inspection could save you from having a more
serious problem trying to run hot right out of the the box. Things like
insulating sleeving could become brittle with age and have started to
disintegrate just sitting in storage.
-Stuart Rohre
K5KVH
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