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Originally Posted by roundscreen
Hook up the meters and run the set for 15 minutes. Check the readings, shut the set off ,discharge the high voltage {ground wire to the 3a3} and put your hand on the flyback{ It should not be hot}. Turn the set back on and do it again. This time run it for 30 minutes. then 45 etc. When you hit 60 minutes the fly will be warm not hot. check your meter readings. Look out for drift:{ big changes in current reading, b+ and hi voltage} I like watching the meters. How the readings change with the action of the picture or when the set warms up.
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I did it tonight. The readings of the test meters:
Start: b+ 371v, horizontal output current 210ma, high voltage 21kv
15 minutes: b+ 372v, horizontal output current 210ma
30 minutes: b+ 374v, horizontal output current 210ma
45 minutes: b+ 372v, horizontal output current 210ma
60 minutes: b+ 371v, horizontal output current 210ma.
No significant changes.
High voltage vary with brightness and contrast. With brightness and contrast at minimum it is 21.3kv, in "normal" position with the best picture it is 21.8kv, but with contrast and brightness at maximum I get a bright and wishywashy picture. High voltage declines down to 13.9kv.
The flyback was a little warmer after 15 minutes and very warm after one hour, not hot, estimated temperature appr. 50 to 55 degrees celsius.