On Jun 20, 11:09 am, "Staring at old audio chassis as a hobby
"
wrote:
On Jun 20, 3:27 am, "John B" wrote:
anyone know where to find a power transformer for a McIntosh MI-200
http://www.mcintoshlabs.com/owners/
Happy Ears!
Al
Nope.
The transformer will have to be rewound or a new one wound from
scratch, probably cheaper.
The old one can be torn down but if you have a good working set,
carefully removing its power transformer and measuring its no-load
turns ratios and the resistances, as well as measuring the voltages in
set (use a HV probe and gloves, there is lethal voltage here) under
quiescent and full power to dummy load operation, will be useful and
an improvement. You then spec the new xfmr to use the same size lams
and stack of height, and may transfer endbells and hardware over if
it's an endbell type. If it's potted, you will have to depot it. Mc
used tar-regular old roofing tar-as a pottant, be advised. IOW a
mess....
Any competent transformer shop can do the wind, it is not necessary
to pay an overpriced specialist like the guy in Wisconsin as this is a
common old power transformer design. Also, you will probably want to
have the primary turns count asjusted slightly for the modern higher
voltage on today's AC service. When your unit was new common AC was
110 to 117, rarely 120, and now it's often rarely that low.