modessitt
Volunteer: Encyclopedia Submission Moderator
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....
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....