[AMPS] 50~ vs 60~ ???

[Ian White, G3SEK]

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

--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com