Yoke Replacement
- From: "Chris F." <zappymanREMOVETHIS@xxxxxxxxxxx>
- Date: Sat, 04 Jun 2005 16:56:22 GMT
This must be one of those "really desperate to fix it" projects. A little
9" color TV/radio combo I picked up in the trash, had a badly burned yoke. I
was able to isolate and insulate the shorted windings, but disturbing the
windings threw the convergence way off and the yoke was still as useless as
ever. Now I just happened to have a good yoke from an identical CRT
(27GDC85X), however it was designed for a completely different set. I
installed it anyway, the vertical windings are a perfect match but the
horizontal ones have too low an impedence - causes high-voltage shutdown
unless powered with a Variac. I determined that the original yoke H winding
was about 13.2 ohms, and the replacement yoke H winding is about 3.9. A bold
idea came to mind; wind an impedence-matching transformer from an old
flyback core and some magnet wire. I have several pounds of AWG 27 and 38
magnet wire that I could do this with. The question is: do I need a 1:1
turns ratio? I suspect I do, this means that the two windings would have the
same number of turns but use different wire gauges.
Think this would work? I know it's a lot more trouble than the old set is
worth, but I'm not exactly busy these days and I hate to junk such a nice
set. 9"-ers are not abundant in my supply, so it's certainly worth an hour
or twos work to get this going.
Thanks for any advice.
.
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