ASR-33 conversion to 220V

dwight elvey dkelvey at
Sun Dec 3 12:02:25 CST 2006

>From: Jos Dreesen / Marian Capel <jos.mar at>
>I want to convert a ASR33 from 110V/50Hz ( yes , 50Hz) to 220V.
>Is it sufficient to swap the motor and fuses ?
>A nice touch of this particular machine is the unused "here is" option.
>I wonder if a small bootloader would fit in it...
>				Jos Dreesen

It makes more sense to use an autotransformer. You can
often use the input leads of a transformer that is intended to
be wired for 110/220. As an autotransformer, it only
has to carry half the current that a full transformer would need.
There are several parts of the machine that use the 110v.
As I recall, things like the reader power supply and the
supply for the keyboard also use the input supply voltage.
It make much more sense to use the original voltage with
an auto transformer.
Since the frequency is the same, there is no issue with belts
and pulleys.

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