That did not work too well.
I tried to wire in a IF section bypass switch at TP1 ( point B) by running a video wire from one end of L9 to a switch on the back of the set and back to the grid of the first video amp, so I could switch between Ext video and video from IF, but the Tuner video was too washed out/ weak, I guess the video lines too and back from the switch added too much resistance for the IF input to work correctly.
External input works great though!
Next time I have the chassis out, I will just have to stick a relay at that point to get it to do what I want, same with the Audio,
Right now with ext video, I tap audio into the volume control R1 at point 30,( V8 Removed ) but I have to boost it by several Dbs or it wont be loud enough , pulled down by inactive sound circuts through c53, I'm sure if I also put a relay to switch in audio and cut out that cap, I wont have to boost it so much.