W0YR wrote:
>
>Uwe is right.
>
>I lived in Moscow 2 1/2 years and Budapest 4 years and managed to cook the
>original plate transformer in a Henry 2K during a contest, even with a fan
>running on it. It grunted a LOT. Replaced it with a heavily rated Peter
>Dahl xfmr and no problems. The voltages will be ok, it's just that the cores
>tend to saturate if you draw a lot of current from the xfmr. Limit your
>current and you should be OK.
>
Henry amps of the 2 x 8874 vintage had a variety of problems on 50Hz.
First was core saturation because the transformer was too small; second,
the tuning cap for the smoothing choke was designed for 120Hz ripple,
and therefore was wrong for 100Hz; and third, the blower was much too
small at the reduced running speed. These three design faults led to a
very hot little box.
These were all quite old models; I don't know about the later and
current Henry amps.
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.com/g3sek
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