TU56/TC11 restoration - VARIAC question

Dwight K. Elvey dwight.elvey at amd.com
Fri Mar 18 12:07:14 CST 2005

>From: "vrs" <vrs at msn.com>
>What you are saying is consistent with what I see on most sites selling
>these things.  There, "run" caps are generally oil, and "start" caps are
>generally electrolytic.  The exception being the occasional "start/run" cap,
>whatever that is.

 I believe that refers to how it is used. During the start,
it is connected to a high current coil but during run, is
is connected to a high resistant one to create phase shift.

>The original caps in the TU56 are high capacitance, and clearly
>electrolytic.  But they appear to be wired for continuous phase shifting
>duty.  Hence some of the people on the list insisting that they are "run"
>caps, and that the beefier, more expensive "run" cap should be used.

 Most likely to make the motor run smoother, as though there
were more phases to the AC.


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