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Thanks Sparkfist!

That's the mod I followed, and I was getting the aforementioned results... but I finally figured out what the problem was after reading throughly over another site's 2600 video mod -- I needed to put a short wire from the Luma point (directly above and to the right of the Chroma ...

Okay, so I tried taking it to work with me and tested it on a Panasonic TV. On this one, I got a rolling screen and dark picture.

I'm still experimenting, but I can't help thinking there's something I've missed.

As the topic states, I recently completed the Original Benheck composite video mod for my little Atari 2600 Jr.

Strangely enough, it works perfectly fine on my Computer's ATI TV Wonder input (well mostly anyways, save for some faint vertical banding) but won't produce any sort of picture at all on ...