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Old 12-30-2017, 12:37 PM
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old_tv_nut old_tv_nut is offline
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Join Date: Jul 2004
Location: Rancho Sahuarita
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Agree: check supply voltages.
Is it changing sweep width or brightness? I gather only vertical?

Also, can you determine if it drops suddenly or gradually? If suddenly, could be something intermittent in the vertical sensitivity adjustment. 2:1 change sounds suspicious.
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