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Try hooking your scope to your 1077's video output and verify that it's capable of about a 5 volt video signal. You can also place a jumper between the 1077's positive bias supply over to the video jack which will allow you to vary the positive bias that the video signal rides on. You'll want your scope set to DC coupling to see the bias level change. That bias supply is floating from ground, so you'll need to ground it's negative side for positive bias. You can also reverse the plus and minus and end up with an adjustable negative bias.
[Edit] I just got to thinking - The 1077's 25 volt bias supply is going to be pretty sensitive to adjust down around 1.5v, so you might put something like a 100k resistor in series between the bias supplies positive output and the video out jack. That should knock the DC bias down to a more manageable level.
Last edited by Kevin Kuehn; 01-31-2017 at 12:43 PM.
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