[Drake] AC-4 transformer

[James C. Garland]

Hi Guillermo,
I believe your are seeing normal behavior. Transformers will run warmer at 
50 Hz, because the reactance of the primary winding is less than at 60 Hz, 
and losses in the core are also higher..  Furthermore, the non-linearity in 
the current drain you note is also expected. Core losses in transformers 
seem to increase quickly at voltages in excess of the rated primary 
voltage. I was testing an old Stancor plate transformer the other day and 
observed exactly the same thing: that you saw: above 110V, with no 
secondary load, the primary current increased rapidly.
73,
Jim Garland W8ZR

At 06:18 AM 11/6/2002, you wrote:
>     Hello Jim, thanks for your answer; line frequency in Argentina is 50 Hz,
>but the AC-4 manual states it will work with either a 50 or 60 Hz line
>(anyway, it doesn't tell nothing about efficiency).
>
>Best regards
>Guillermo - LU8EYW.