Quote:
Originally Posted by Yamamaya42
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.
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Not likely a resistance problem, but too much stray capacitance with the long wires. A relay would still be the fix.