Can somebody measure a U3100 yoke for me?

modessitt

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I have a chirping U3100 I'm trying to get running for a 48-in-1 cab. Came to me not working, with all the neck pins busted off. I swapped tubes, transferring the original yoke and chassis over, only to get the chirping.

What's interesting is that it comes up if I don't connect the horizontal yoke. If I hook up the vertical yoke only, the monitor powers up with a vertical line on the tube. The HOT has been replaced, and all the surrounding parts seem to test okay.

Measuring the yoke, I get these readings:

Horizontal - 0.8 ohms
Vertical - 6.0 ohms

Not sure if they are correct. Also don't know if a bad horizontal yoke would show up as a chirping monitor.

If I can eliminate the yoke as a problem, then I'll obviously be able to concentrate on the voltage output of to the horizontal yoke, and trace back through the circuitry to find my issue....
 
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while im not expert mod, i think id pull off the yoke and look it over well..

i think that winding in the yoke might be shorted... that reading is awfully,awfully low.

mabye youll get lucky and see where the shellac coating came off and wires are shorting, or mabye find a cap lead or blob of solder in there or something...
 
while im not expert mod, i think id pull off the yoke and look it over well..

i think that winding in the yoke might be shorted... that reading is awfully,awfully low.

mabye youll get lucky and see where the shellac coating came off and wires are shorting, or mabye find a cap lead or blob of solder in there or something...

Maybe. The monitor is basically new, until Rufus McDoofus got ahold of it and screwed it up. I may just wait for someone to give me a reading (hopefully soon) of a good one before I go to all that trouble...
 
Still need this. I'd hate to spend a crapload of time changing out parts that appear good only to find that my entire problem is a bad horizontal yoke.

Monitor powers up with a vertical line if horizontal yoke is unplugged, but chirps if horizontal yoke is connected. Chirping is louder if no VGA signal is applied, softer when it is.

B+ is nice and steady when the vertical yoke is applied, but it fluctuates between zero and about 40v with the horizontal yoke applied also. The fluctuation is in time with the chirps....
 
send a pm to falcon

this is a longshot but i remember seeing a 19" vga in his garage... he couldnt get it to work with a 48-1 for some reason..

mabye youll get luvky and its the same model your after...
 
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