Squealing Kortek Monitors

weshope

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I'm new to the board. Had games for last 25+ years. I just ordered some Kortek monitors to replace some of the old WG's in some of my classic games. I would have used Vision Pro monitors as I did last year to update 10 monitors, but Happ doesn't have them anymore. Anyway, bought these Korteks from another big supply house and started installing. I replaced 4 monitors and 3 died within 1 hour. Now they just squeal and no picture. I am installing these the same way I did the last 10 vision pros. What am I not doing right? I've been using isolation transformers. I'm at a loss.
 
I think I've heard bad things about the Korteks. Just FYI, there's also a monitor repair section.

Welcome to the boards.
 
I spoke with someone in tech support that supplies these monitors to Competitive Products and was told there is a known problem with the Korteks that have recently been sold. They are working on a fix. I hope so since I own several of these monitors now. I would have rather had another monitor, but thanks to the LCD's and the shrinking supply of 19" CRT suppliers, there aren't many options for new monitors.
 
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