Yoke Replacement



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.


.



Relevant Pages

  • Re: Yoke Replacement
    ... > 9" color TV/radio combo I picked up in the trash, had a badly burned yoke. ... > was able to isolate and insulate the shorted windings, ... > magnet wire that I could do this with. ... More the the impedance is the inductance. ...
    (sci.electronics.repair)
  • Re: DIY Amplifone Yoke
    ... The yoke certainly does look very regular, identical in shape to a G07 ... windings on X, ... Since the G08 uses a 100 degree tube, the deflection board has to work ...
    (rec.games.video.arcade.collecting)
  • bush ws6674 widescreen tv
    ... the pins on the horizontal output to the yoke connecter were burned with ... bit low resistance but could this be because its a widescreen tv and needs ... assumption that the poor solder on the horizontal connector caused arcing ...
    (sci.electronics.repair)
  • FIXED! Samsung projector tv, how I locate a bad yoke?
    ... That was lucky one, the green yoke horizontal (pair of windings, the ... one halve of horizontal windings went partially toast-burned style ... that is very lucky that owner didn't have to pay for a CRT! ...
    (sci.electronics.repair)
  • Re: Is there any reason no one can reproduce Ampliphone Vector Monitor Boards
    ... the impeadence differences are very small when comparing horozontal ... yoke here measuring 80 ohms, in comparison to the g08 yoke measuring ... about 1 ohm. ... windings were around 1ohm and 1.5mH. ...
    (rec.games.video.arcade.collecting)