Korg MS-20 power transformer, part 2

[Harry Bissell]

If you have the tranny wired for 120V, you can use a voltmeter to measure the
voltages at the other primary taps... it will not be isolated so watch out for
shock hazard,
but the voltages will be a much more accurate representation of the tap
ratings than
resistance will be. Maybe the tranny is a 120 / 200 / 240 unit ???

H^) harry

The Old Crow wrote:

>   FYI, I went ahead and took the machine all the way apart and figured out
> the rewiring.  The unloaded secondary showed about 42VAC (21VAC to the
> center tap).  The primary showed a resistance of 136 Ohms for the original
> 240VAC configuration.  tinning up the extra primary leads and measuring
> about, I got the following:
>
>    yellow     orange     brown      black <--transfomer primary leads
>      |__15 Ohm__|__80 Ohm__|__41 Ohm__|
>      |          |          |          |
>      |          |__115VAC__|          |
>      |                                |
>      |_____________230VAC_____________|
>
>   The 80 Ohm orange-brown pair seemed to be close enough to 1/2 of the 136
> Ohm yellow-black pair to test out on my Variac set to 115VAC.  Secondary
> showed 42VAC unloaded.  After reassembly, the MS20 seems to be doing fine
> on 115VAC off a power strip.
>
>   Now to dig out the Greenlee and punch the rear chassis plate for a
> standard power socket and a DIN-5 at some point.
>
> Crow
>
> /**/