modessitt
Volunteer: Encyclopedia Submission Moderator
I'm seriously considering making the attempt as I can't find a replacement anywhere...
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I've been thinking about unwinding it, figuring out where the broken strands reconnect, and seeing if I can get a proper reading again. Thoughts?
This is a med-res yoke, and I've already learned from experience that another yoke with the same ohm-reading will NOT work as a replacement.
I don't suppose there is a way to measure impedance with a DMM?
So you know what the original readings are then?
Wonder how close it is to something like a K4915?
Have you googled the numbers off of the label on the yoke? I've found that Wells-Gardner used lots of Samsung yokes. Some are still available from Samsung (SEMCO).
Okay, I've been measuring from the terminals to the broken points, and I have found two strands - one connecting to each side. From one strand to a terminal, I get about 3-4 ohms. From the other strand to the other terminal, I get about 39-40 ohms. Now, the vertical yoke is normally about 44 ohms, so I'm thinking if I connect these two strands, I should have a complete yoke again, albeit with a few less windings than original.
Now, how to connect the strands? I guess I can file the ends a bit to remove any coating, then solder them together? Do I need to heat-shrink it or anything to keep from accidentally touching it during a yoke adjustment? Could I take a short length of insulated wire and use that to connect them (hard to get in there), or would the voltage through the yoke burn off the insulation?
I'm going to connect this somehow and then hook it up this weekend to see what happens, so anything that can help is appreciated. I know that if I can get this yoke repaired and working, the owner will be VERY happy....
all of your assumptions are correct - I add that the resistance is not that citical. A few extra or a few less windings will make no difference. Over the years I have repaired many yokes with burnt wires caused by the rubber wedges going 'gooey' and frizzling the wires. I have had about a 50% success ate. Good luck.
Thanks. any insight on connecting the strands?
There used to be an enamel coating that was created for the TV industry.... I haven't seen it in years though.
You need something heat resistant that can be 'painted on' or some tiny heat shrink tubing.
I wonder if you could use something like a decent two part epoxy and coat it with that?