MatCat:
So should I build 4 exact copies of the amp for each output with a single driving input?
That might work, but I have no way of knowing that the existing video input signal shown of that schematic can drive four such amp stages. Perhaps there might be commercial amplified video splitter devices available better suited then trying to roll our own?
http://www.cablewholesale.com/specs/composite-splitter/41r4-13500.htm?utm_source=GoogleShopping&utm_medium=organic&zmam=54972865&zmas=1&zmac=1&zmap=41R4-13500&gclid=CJX_l4mw2bICFQpgMgodgn4AxA
Lefty