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What is unknown about the Sony, is what the peak-to-peak voltage of the video signal out of the buffer chip is, and if it is positive or inverted, chances are that one is positive, one is inverted (11,12) but w/o an oscilloscope to look and see what they are, this is a risk factor that it may or may not work due to the unknown factors of not really knowing what is being put out of the IC, for example, if you knew that it was putting out .5v positive peak-to-peak, then you could build an amp with enough gain to boost it to 5v.
On the other hand, a DVD/VCR always has an output of 1v peak-to-peak, thus you make a amp with a gain of +5, more or less.
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