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Check horizontal output current
I remember when I first got into repairing color tv's at a small shop. The owner insisted on checking horizontal output tube current and high voltage. It appeared useless at first but I found quick over half of the sets were drawing too much current. Once these problems were remedied (alot of times after they fried the flyback) we saw few flyback problems as well as much longer damper and Horizontal output tube life. My Magnavox draws a bit over 200 milliamperes after it has been on about two hours.
I had a Motorola TS-905 for a long time (wish I still did) that never needed it's horizontal tube replaced. I guess this was a lesson well learned!
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