Adding Composite Input (Capacitor Question)

[Electronic M]

Originally Posted by ARC Tech-109

The reason for doing it this way is so I can mechanically isolate the video input line from the grid of the 1st video amp when using the tuner and then cut the IF amp off when using the video input so I don't get swamped with mixer noise. Not cutting the grid out of the existing circuit as I see no need to and this way the modifications are kept to a minimum.

I haven't seen mixer noise doing it the way I have. Neither circuit noticably interferes with the other when the video amp grid is switched.