Quote:
Originally Posted by old_coot88
If the vid detector diode was in backwards, you would definitely know it. Vts1134 can tell you. He encountered exactly that problem in his Majestic 1600 "Mighty Monarch of the Air" resto.
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Highly likely but not completely guaranteed either. Electrostatic sets with weak CRTs particularly 7JP4s have been known to develop negative picture when overdriven...If someone installed the diode backwards with the CRT weak and cranked the brightness/contrast till the video on screen inverted then you have a double negative making a positive.............This now has me curious what that condition would look like on such a CRT VS under driven with correct video polarity.
I wonder if that would be a way to milk more output from tired CRTs.