On Mar 11, 2010, at 8:36 PM, Garey Barrell wrote:
Yeah, they all run hot. I don't know if they are short on iron, or
copper, or what. They are epoxy sealed, which I guess makes them
run a little hotter. All that aside, I have yet to see one fail
unless a cap shorted and someone had replaced the fuse with a piece
of #000 wire.... (I've seen both.... :-) )
Don't forget that a transformer is not 100% efficient. At 60Hz about
15% to 20% of the electricty in comes out as heat. So if your receiver
draws an amp at 115 volts, around 20 watts of heat are coming out of
it. Some "solid state" receivers are notorius for "running hot", the
Kenwood r5000 and Drake R8 for example.
As an aside, you would be surprised to find out how many people move
here (or to other countires with 220/230/240 volt 50Hz power) and
bring their old appliances because they were told it is easy to get a
transformer for them. Easy yes, cheap no. Someone I know just paid
$150 for a custom made transformer for her vacuum cleaner which will
put out almost 200 watts of heat on its own. :-(
Geoff.
--
geoffrey mendelson N3OWJ/4X1GM
Jerusalem Israel [email protected]
New word I coined 12/13/09, "Sub-Wikipedia" adj, describing knowledge
or understanding, as in he has a sub-wikipedia understanding of the
situation. i.e possessing less facts or information than can be found
in the Wikipedia.
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