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I checked that one does not have the blanking diodes. I would try another
6U10 (gets the horz blanking pulse from one of the cathodes of that tube), and check the 560k resistor on one side of the brightness pot which goes to the 6U10. That is assuming the issue is lack of blanking during horz retrace. I noticed later models changed the resistor on the cathode of that 6U10 from 100 to 330 ohms, perhaps to provide a stronger pulse?
Last edited by DaveWM; 08-29-2011 at 03:57 PM.
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