CRT image trouble

Possibly a capacitor in the power supply has dried up a bit, lost lots of capacitance, and now the supply line for the vertical deflection of for horizontal (or both) has a huge 60/120Hz ripple.

This transformer is magnetically coupling to the Neck of the CRT !!! Reposition it to minimize coupling to the CRT Yukio YANO

Hello all,

I am posting this as a follow up for the archive. I spoke with a tech at Happ Controls about this model of monitor. It does not require an isolation transformer. I removed the isolation transformer in my game, and I still have the undulating image. The tech suggested that even thought the monitor is only 8 years old with minimal use it probably needs a cap kit.

Thank you all for the suggestions and ideas!

Regards, Dan

Sadly, the average quality of electrolytics (especially larger ones) has deteriorated significantly. I have here a few radios from the 50's, all with their original electrolytics and fully functional. These things get hot in there and heat is the enemy #1 for electrolytics. Yet none failed in about 60 years. I guess that's kind of impossible these days. Or in plain English, not everything in electronics is progress :-(

If you put new caps in there make sure to get 105C grade. A few cents more but well worth it.

True.

Yes but they were about ten times the size too ! :-)

Absolutely.

Graham

Not necessarily. As a kid I scrapped some smaller electrolytics out of TV sets. Not to pinch pennies but because I didn't trust the stuff from electronics dealers. Just for fun I measured a few with date codes from the early 60's. Without exception all above their rated capacitance and no leakage to write home about.